This isn't my first time in a plane. I flew had been flying have flown was flying many times already.

I was looking have looked have been looking looked for my key for three hours now and I still can't find it!

I wanted to play tennis yesterday, but it rained has been raining has rained was raining when I finished work.

Patrick isn't answering the phone. Perhaps he has been going was going has gone went out for the afternoon.

I can't understand this text and I have read read have been reading was reading it three times since last Monday.