💡 We use the present perfect simple here. The thirty-year duration feels settled and permanent — a fixed fact about Marco. 'Has been working' is possible but less natural when the situation feels like a settled identity. 'Worked' and 'is working' are wrong tenses here.

💡 We use the present perfect continuous here. The activity is clearly still in progress right now. 'Have run' presents it as a settled fact, which feels wrong when the speaker says they are still going. 'Ran' and 'am running' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Know' is a state verb, so we never use the continuous form. 'Has been knowing' is always wrong. 'Knew' and 'is knowing' are the wrong tenses.

💡 We use the present perfect continuous here. Six months is a short, recent duration and the situation still feels like an ongoing chapter, not a settled fact. 'Have lived' is possible but less natural here. 'Lived' and 'are living' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Own' is a state verb, so the continuous form is always wrong. The long duration also makes this feel like a settled fact. 'Owned' and 'is owning' are the wrong tenses.

💡 We use the present perfect simple here. The very long duration makes tennis a settled part of the speaker's identity. Note: 'have been playing' is also grammatically possible, but 'have played' is more natural for a lifelong settled habit. 'Played' and 'am playing' are the wrong tenses.

💡 We use the present perfect continuous here. Three months is a recent, short duration and the work is still in progress — it is an ongoing chapter. 'Has worked' presents it as a settled fact, which is less natural. 'Worked' and 'is working' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Believe' is a state verb, so the continuous is always wrong. 'Believed' and 'is believing' are the wrong tenses.

💡 We use the present perfect simple here. Twenty-five years makes this feel like a settled, permanent fact rather than an ongoing chapter. 'Has been teaching' is grammatically possible but less natural for such a long, established duration. 'Taught' and 'is teaching' are the wrong tenses.

💡 We use the present perfect continuous here. Two years is a short, recent duration and the speaker says they are still in the middle of it — it is clearly an ongoing activity. 'Have studied' is less natural here. 'Studied' and 'am studying' are the wrong tenses.

💡 We use the present perfect simple here. Since 1950 is a very long, settled duration. The situation is presented as a permanent, fixed fact about the company. 'Has been producing' is possible but less natural for such an established, long-term situation. 'Produced' and 'is producing' are the wrong tenses.

💡 We use the present perfect continuous here. The waiting is clearly still in progress right now, and the short duration feels like an ongoing, active situation. 'Has waited' presents it as a settled fact, which feels wrong here. 'Waited' and 'is waiting' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Love' is a state verb, so the continuous is always wrong. The long duration also makes this a settled identity. 'Loved' and 'am loving' are the wrong tenses.

💡 We use the present perfect simple here. Thirty years makes this a settled, fixed fact. 'Has been working' is possible but less natural when the situation is clearly permanent. 'Is working' and 'worked' are the wrong tenses.

🇮🇹 Note for Italian speakers: in Italian you might use 'lavora da trent'anni' for both meanings. In English, the choice between simple and continuous changes the feeling — settled fact vs ongoing activity.

💡 We use the present perfect continuous here. The search started this morning and is still in progress right now. This is a short, active, ongoing situation. 'Have looked' is less natural when the activity is clearly still happening. 'Are looking' and 'looked' are the wrong tenses.

💡 We use the present perfect simple here. Since 1985 is a very long duration and the situation is clearly a permanent, settled fact. 'Have been living' is possible but less natural for such a long, established situation. 'Are living' and 'lived' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Own' is a state verb, so the continuous is always wrong. 'Have been owning' is never correct. 'Am owning' and 'owned' are the wrong tenses.

💡 We use the present perfect continuous here. Four months is a short, recent duration and the speaker describes it as still in progress — an ongoing chapter. 'Has worked' presents it as a settled fact, which does not match the speaker's feeling. 'Is working' and 'worked' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Know' is a state verb, so the continuous is always wrong. 'Have been knowing' is never correct. 'Are knowing' and 'knew' are the wrong tenses.

🇮🇹 Note for Italian speakers: 'conoscere' is a state verb in English too. We never say 'have been knowing' — always 'have known'.

💡 We use the present perfect simple here. Studying since age twelve is a very long duration that feels like a settled part of the speaker's life. 'Have been studying' is possible but less natural when the duration is this long and established. 'Am studying' and 'studied' are the wrong tenses.

💡 We use the present perfect continuous here. A few weeks is a short, recent duration and the work is still in progress. This is an ongoing activity, not a settled fact. 'Has tested' is less natural when the action is clearly still happening. 'Is testing' and 'tested' are the wrong tenses.

💡 We use the present perfect simple here. Since 1902 is a very long, established duration. The situation is a permanent, settled fact about the museum. 'Has been displaying' is possible but less natural for such a long, fixed situation. 'Is displaying' and 'displayed' are the wrong tenses.

💡 We use the present perfect simple with state verbs. 'Have' used for a physical state like a headache is a state verb, so the continuous is wrong. 'Have been having' is not correct here. 'Am having' and 'had' are the wrong tenses.

🇮🇹 Note for Italian speakers: 'avere' as a state verb (to have a headache, to have a car) behaves like a state verb in English. We do not use the continuous form.

💡 We use the present perfect continuous here. All afternoon is a recent, short duration and the activity has just finished or is still going. This feels like an active, ongoing situation rather than a settled fact. 'Have played' is less natural here. 'Are playing' and 'played' are the wrong tenses.

💡 We use the present perfect simple here. Twenty-two years is a long duration and the situation is presented as a permanent, settled fact. 'Has been working' is grammatically possible but less natural when the duration is this long and the situation feels so fixed. 'Is working' and 'worked' are the wrong tenses.