Put the verbs in brackets into the present perfect or present perfect progressive. 1) you (clean) the house for hours. why don't you have a rest? 2) it's the most beautiful garden we (ever/see). 3) i (wait) for you since 10 o'clock this morning. where (you/be)? 4) how long (sam/study) science?

You have been cleaning the house for hours. Why don't you have a rest?
It's the most beautiful garden we have ever seen.
I have been waiting for you since 10 o'clock this morning. Where have you been?
How long has Sam been studying Science?

1. have been cleaning
2. have ever seen
3. have been waiting // Where have you been?
4. How long has Sam studied Science? ( Present Perfect )
(How long has been Sam studying Science - Present Perfect Progressive )