We use the present perfect to show that something has continued up to the present

They’ve been married for nearly fifty years.
She has lived in Liverpool all her life.

… or is important in the present:

I’ve lost my keys. I can’t get into the house.
Teresa isn’t at home. I think she has gone shopping.

We use the present perfect continuous to show that something has been continuing up to the present:

It’s been raining for hours.
We’ve been waiting here since six o’clock this morning.

We use the past perfect to show that something continued up to a time in the past:

When George died he and Anne had been married for nearly fifty years.

... or was important at that time in the past:

I couldn’t get into the house. I had lost my keys.
Teresa wasn’t at home. She had gone shopping.

We use the past perfect continuous to show that something had been continuing up to a time in the past or was important at that time in the past:

Everything was wet. It had been raining for hours.
He was a wonderful guitarist. He had been playing ever since he was a teenager.

We use will with the perfect to show that something will be complete at some time in the future:

In a few years they will have discovered a cure for the common cold.
I can come out tonight. I'll have finished my homework by then.

We use would with the perfect to refer to something that did not happen in the past but would have happened if the conditions had been right:

If you had asked me I would have helped you.
I would have helped you, but you didn’t ask me.
You didn’t ask me or I would have helped you.

We use other modals with perfective aspect when we are looking back from a point in time when something might have happened, should have happened or would have happened.

The point of time may be in the future:

We’ll meet again next week. We might have finished the work by then.
I will phone at six o’clock. He should have got home by then.

the present:

It’s getting late. They should have arrived by now.
He’s still not here. He must have missed his train.

or the past:

I wasn’t feeling well. I must have eaten something bad.
I checked my cell phone. She could have left a message.




How can improve my writing skill? I can do it somewhere here?

i understand it but i can't use it in the writing or use it in the speak how can i improve that pleaze help me if you can

This is a very common problem. Many students find that they can't easily use language, even though they understand it. There isn't an easy answer, but lots of practice can help, especially if it's designed to help you prepare to use sentences in a way that you would in normal communication. If you have a teacher, they are the best person to help you with this or you could try to think about how you use English and create example sentences on your own.
Best wishes,
The LearnEnglish Team

oh thank you so much your encourage sentence for me and another friends
I will make an endeavor for engilsh study.
and the Don't forget your kindness. Never~

Friends, my english is very bad, I hope understand you and be patient for now, and improve my pronunciation and gramma.

hello .please i need help i' m studying english but my level is bad .what shall i do to improve it

it's ok, guy .when i start learning english . Im even worse than you, beleive me. Even now im not good, too. You are really not bad like what you think it  is . Let's learn day by day . don't force yourself just relax and enjoy english. You will feel beter.
good study !

Great comment, Thuý!
The LearnEnglish Team

hi thank u all frinends am new in this site am  english student in the university but i find some difficult in grammar can u help me i ll be very gratful

hello to every 1
i want to improve my speaking skill how can i improve it ??