Isit on the bench by the lake, составить это предложение в временах; pr. cont, pr. perf, past cont, past simple и в past perf.

I sit on the bench by the lake
I am sitting on the bench by the lake - Present Cont.
I have sat on the bench by the lake - Present Perfect
I was sitting on the bench by the lake - Past Cont.
I sat on the bench by the lake - Past Simple
I had sat on the bench by the lake - Past Perfect