Упражнение 4. Make questions using either Present Perfect or Present Perfect Continuous 1. My friend is waiting for me at the station. (How long...?) 2. He translates books. (How many...?)

Решение:

1. How long has your friend been waiting for you at the station? (Present Perfect Continuous, так как вопрос о длительности действия.)
2. How many books has he translated? (Present Perfect, так как вопрос о количестве выполненных действий.)