Present perfect use as well when we talk about current events (eg. News /), where the emphasis is g

Past participle -ed consists of either (for regular verbs) or use a third form of irregular verbs (gone, been, eaten ... etc) Negation NOT created by adding the auxiliary verb HAVE / HAS. Questions form the changeover of the auxiliary verb HAVE / HAS subject before.
Perfect tense we use when we talk about storylines (mainly stocks), which began in the past and continue to exist or persist in the presence of. I 'in known John since 2005. (= give began in 2005 and still takes) I' in worked in this recording studio for two months. (= Story began two months ago and still takes)
The Present uses the same when talking about storylines that have ever occurred in the past, but still as may occur in the future. The period of time in which the story is not over previously played (speaking it considers running). The story could have in the past not to play only once. I've Been to Mexico many times. (= I'm still alive, my life continues, it is therefore possible that in Mexico still can get) JK Rowling has written a lot of books. (= Writer is still alive, still can write something)
If time expressions in suggesting finished period, we use the past tense. If the unexpired term suggests, we use the Present Perfect. Have you met him this morning? - THIS MORNING period not over yet, so it is still morning and thus give over a given period may be again to play / modify Did you meet him this morning? - THIS MORNING period has ended, example. afternoon, evening, and thus give during the period not to happen again / modify food truck race
It did not snow yesterday. - YESTERDAY (= closed period) It was very hot last week. - LAST WEEK (= closed period) I was very patient when I was a child. - WHEN I WAS A CHILD (= closed period) She did her homework five minutes ago. - FIVE MINUTES AGO (= closed period) He kissed me on Monday. - ON MONDAY (= closed period) I worked here for twenty years. - Past tense indicates a completed period, ie in the presence food truck race here does not work anymore
It has not snowed today. - TODAY (= running time - still exists today) food truck race I have worked here for twenty years. - Present Perfect suggests running time, that currently there is still work Sarah has not done very well so far. - SO FAR (= running time) I have not seen Lisa this afternoon. - THIS AFTERNOON (= running food truck race time)
Present perfect use as well when we talk about current events (eg. News /), where the emphasis is given to the event by speaking seen as a sure fact at present. In these sentences are not accurate timestamp. Have you heard? The prime minister has been shot by an old man. Ow! I 'in cut my finger.
If you keep talking food truck race about this new (we are talking about closer details concerning already like. Time), we use the simple past tense. He was shot because he was outside a shop without his bodyguards. A: Ow! I've cut myself shaving. B: How did you do that?
The Present uses the same when talking about frequency / frequency plot for unfinished period. By the end of the period, we use the past tense. How long did you work in these conditions? food truck race - How long have you worked in those conditions? (= Do not work there) How long have you worked in these conditions? - How long (longer) working in those conditions? (= Still works there) How many books did Shakespeare write? - Is dead, now writes more books How many books JK Rowling has written? - Alive, still can write some
Present perfect use further food truck race if we express the human experience with some storyline (talking about what he witnessed / experienced yet) and he is still alive. If a person is dead, and we talk about his experiences, we have to use the past tense. I have been to London. I have never had a lot of money.
Present perfect use as well when we talk about the plot, which is all played in the past, but the emphasis is on the result or effect of the presence. This process is linked to the presence. food truck race A: "Where is your book? " B:" Someone has stolen it. "(Book of the presence is not, therefore, it can not be used for the purposes for which it was for me ..) And:" Is Peter at home? " B:" Well, he has gone out. "(He left his departure von influenced presence so that there is someone with him and can not talk ...) The lift has broken down. (Elevator broke down. The influence of the presence of = for example. We need to go on foot)
Present perfect can specify the following adverbs. In these sentences talk about what has happened so far and on the contrary, food truck race what is to happen now. This is a typical example, if we use the Present Perfect. I've already seen it. - I've seen it. Has he come yet? - I come from? My brother has not returned yet. - My brother