Past with a finished time and Present perfect with a unfinished time. Past Simple: about a finished situation, a finished time. Keywords: 15 minutes ago, 2 hours ago, yesterday, last…

Present perfect simple (I have done) or Past Simple (I did)? Present Perfect and Past, the differences.   British and American have different rules for the use of the present…

Express the time: When, How long, For, During, While, Since A/ WHEN = "which moment": we can use past simple, present, and future (will). When + past simple: When did…

How long, when, for, since FOR / SINCE: we want to say how long something has been happening. FOR + periode of a time (one hour, one week, one year,…

How long have you (been) ... ? How long + Present Perfect.   Remember: We use the present perfect to tell something that has started in the past, and still…