Present perfect

Tom is looking for his key.He can`t find it. He has lost his keys.
have/has+the third conjugation of a verb{this is present perfect tense}
Ex: Where is Sue? I don`t know . She has gone to the market.
My father has just arrived home.
I have already bought a new computer.

• We use this tense to express actions that ended a short time ago.
• We can use this tense with the following words{ just- already- ever-never-yet}
• We use yet in at the end of questions and negative sentences
• We use this tense to express actions that ended and have an effects now

Ex: Ann can`t walk now.she has a broken leg

we use ever in questions and in some sentences to express past experiences

Ex: I have just arrived home{ means I arrived a short time ago

He has never seen this scene.

I haven`t finished my work yet.

Has your uncle sold his old car yet?

I have never been to Paris.

This is the most interesting story I have ever read.

has/ have been to+ place{means went to it and returned}

has/have gone to+ place{means went to it and still there}

Ex: I have been to London three times this year

where is Sue? She has gone to the supermarket

Tom has gone out . He will return after half an hour