Ingles Temas Dificiles

Unit 1: Past simple vs. Present perfect simple.
1. - We use the past simple to talk about complete events which are finished, or before “now”, the moment of speaking. I called you yesterday. Wherewere you? We didn’t have computers when I was born.
2. - We use the present perfect to connect the past and “now”, the moment of speaking. We’ve called you three times today. Where have you been? ,We’ve lived in the same house all our lives.
3. – Use the past simple with minutes ago, yesterday, last week, when I was….etc. We often use for, since, just, already, yet, even and never with thepresent perfect. They went out a few minutes ago. , I saw that movie yesterday. , I met her boyfriend last weekend. , We moved there when I was young. , They´ve just left. , I´ve already seen that film. ,I´ve never met your girlfriend. , We’ve lived there since I was a child.
Time expressions:
1. - We use just before the past participle to say that something happened a short time ago. We’ve justarrived. , They’ve just gone out.
2. - We use already at the end of the sentence or before the past participle to express surprise or emphasise that something happened. Have you finished already?We’ve already seen this film.
3. - We use yet at the end of negative sentence to emphasise that something didn´t happen (but probably will in the future), and at the end of questions. I haven´t startedthis exercise yet. (But I will). Have you met my new boyfriend yet?
4. - We use still before haven’t in negative sentences, or before not in questions, to show surprise that something you expectedto happen didn´t happen. I can´t believe you still haven´t said sorry. Has she still not told you the truth?
Unit 2:
Past simple vs. past continuous.
1.- We use the past simple to talk aboutactions that happened in the past at one moment in time in the past. We use the past continuous to describe the background actions in progress around that time in the past. I was playing football....