How to Use the Present Perfect Continuous Tense in American English ...
Learn how to use the present perfect tense correctly. Understand the function of marker words and how they affect the meaning ...
The present perfect with 'for' and 'since' Comparatives and superlatives Present perfect with 'just', 'already' and 'yet' Defining relative clauses Might, may, could How to use 'used to' Subject ...