Click+to+see+Solutions+only+after+you+have+completed+them+all!.

Present perfect
1. I have worked in this office for a few days (started) I **started** working in this office a few days **ago** 2. I have worked in this office for a few days. (ago) I **began** working in this office a few days **ago** 3. I started working for IBM in the year 2001. (since) I have worked for IBM **since** 2001 4. I started living in this house twenty years ago (for) I have lived in this house **for** 20 years 5. The last time I was abroad was in the summer of 2015 ( for /ago) I haven't been abroad **for** two years. I haven't been abroad **since** 2015. The last time I was abroad was two years **ago**

Conditional clauses
1. They were arrested because they travelled with false passports (if) (third conditional) If they **hadn't travelled** with false passports **they woudn't have been** arrested. 2. We haven't got central heating so the house is rather cold. (if) (second conditional) If we **had** central heating the house the house **wouldn't be** so cold 3. We didn't visit the museum because we didn't have time (if) (third conditional) If we **had had** time we **would have visited** the museum 4. I don't have a car so I can't drive you to the airport (if) (second conditional) If I **had** a car I **could** drive to the airport 5. I didn't work hard at school so I didn't get a good job when I left (if) (third conditional) If I **had worked** hard at school I **would have got** a good job 6. People drive fast that's why there are so many accidents. (if) If people **didn't drive** so fast **there wouldn't be** so many accidents 7. I may go to the beach this afternoon depending on the weather. (if)( first conditional) If the weather **is** good I **may** go to the beach. If the weather **is** good I **will** go to the beach. 8. If you don't study hard you won't be able to enrol in medicine. (unless) (first conditional) 9. If you don't hurry up, you won't get tickets for the concert. (UNLESS)
 * Unless you study** hard **you won't be able** to enrol in medicine.
 * Unless you hurry up** you **won't get** tickets for the concert.
 * You won't get** tickets for the concert, **unless you hurry.**

Uses of WISH/ iF ONLY
1. I am sorry I didn´t remember your birthday. (Regrets a past situation) I wish I **had remembered** your birthday 2. He didn't revise for the test so he failed.(Regrets a past situation) He wishes he **had revised** for the test. (if so he wouldn't have failed) 3. I would like to have more free time.(Regrets a present situation) I wish I **had** more free time. 4. Mary was sorry she ate so many cakes.(Regrets a past situation) Mary wishes **she hadn't eaten** so many cakes