Tom has already written ten e-mails to his teacher., Why have so many trees disappeared?, They haven't answered yet., The price of oil has increased since April., We have heard about the company's plans to build a new pipeline., It hasn't rained for weeks., I haven't been to Canada yet., Have you ever been to Ottawa?, He has had a job in Montreal since 2017., We have learned English since 3rd grade.

present perfect

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