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A/

1. Lan received a letter from her friend yesterday. 

2. I had my fìrst experience of farm work on a trip to the countryside.

3. This is the first time I have ever met such a pretty girl.

4. In our countrỵ, it is against the law to discriminate against any ethnic group.

B/

1. Lan studies hard in order to get good marks.

2. She cooks worse than me.

3. I last saw him five years ago.

4. Lan is interested in hanging out with friends.

A.
1. a/received/ Lan/ letter/ yesterday/ her/ from/ friend.
→ Yesterday, Lan received a letter from her friend.
2. first/ farm work/ trip/ countryside/ I/ had/ experience/ my/ of/ on/ the/ a/ to/.
→ I had my fìrst experience of farm work on a trip to the countryside.
3. girl/ a/ This/ is/ ever/ I/ the/ first/ have/ time/ met/ such/ pretty/.
→ This is the first time I have ever met such a pretty girl.
4. it/ law/ discriminate/ is/ group/ to/ against/ ethnic/ any/ In our country, / the against/.
→ In our countrỵ, it is against the law to discriminate against any ethnic group.
B. 
1. Lan studies hard. She gets good marks. ( in order to)
→ Lan studies hard in order to get good marks.
2. I'm a better cook than her.
→ She cooks worse than me.
3. I haven't met him for five years.
→ I last saw him for five years ago.
4. Lan really loves hanging out with friends.
→ Lan is interested  in hanging out with friends.