Present perfect

We use present perfect to talk about events that happened in the past when we think the effect on the present is important.

Example:

“I have lost my keys.” – I lost my keys in the past and I have not found them yet. I can’t open my door.

“I have finished the meal and paid the bill.” – We can leave the restaurant and go home now.

We form the present perfect like this: SUBJECT + have/has + past participle.