Yet in a sentence present perfect

We usually use short forms ( I've , You've , He's , etc.) when we are speaking and in informal writing.

We can use the present perfect negative with yet : Subject + haven't/hasn't + past participle + yet .

Negative (-)
Subject	auxiliary	past participle		yet
I	haven't	made	a decision	yet .
She	hasn't	finished	it	yet .

We can form present perfect questions with yet : Have/Has + subject + past participle + yet ?

Yes/no questions (?)
Auxiliary	subject	past participle		yet
Have	you	seen	that film	yet ?
Has	he	made	a decision	yet ?

We form short answers with: Yes + subject + have/has . No + subject + haven't/hasn't . Regular verbs have past participles which are the same as their past simple forms , ending -ed .

visit → visit ed arrive → arriv ed

Irregular verbs have irregular past participles . Sometimes the past participle of an irregular verb is the same as the past simple form and sometimes it is different.

have, had → had lose, lost → lost
do, did → done eat, ate → eaten

In British English, we use the present perfect with just , already and yet to talk about recent events and actions.

We use just in positive sentences to talk about very recent events or actions.

She 's just won the match.
They 've just made a big announcement.

We use yet in questions and negative sentences to talk about actions and events happening up to now.

Have you finished that book yet ?
I haven't made a decision yet .

We use already in positive sentences to talk about actions and events that happened before now or earlier than expected.

I 've already visited three universities.
Spring has already arrived in Madrid!