`1.` You cannot compare these two artists. COMPARISON

`to` There is no comparison between these two artists.

`-`  Ta dựa vào: You cannot compare these two artists.

`-` cannot `to` no.

`-` compare `to` comparison

`-` comparison+ with+ Sth.

`-` There is/ are+ no+ comparison(N)+ with+ Sth.
`2.` The number of students at the college suddenly increased. INCREASE

`to` There was a sudden increase in the number of students at the college.

`-` Ta có thể làm cách khác nếu không để increase:

`to` There was a sudden rise in the number of students at the college.

`to` There was a sudden growth in the number of students at the college.

`to` There was a sudden upward trend in the number of students at the college.
`-` Vì increase = rise = growth = upward trend: đều chỉ xu hướng tăng.

Hoặc có thể ta dùng chỉ xu hướng mạnh hơn thì: 

`to` There was a sudden rocket in the number of students at the college.

`to` There was a sudden soar in the number of students at the college.

`to` There was a sudden leap in the number of students at the college.

`to` There was a sudden jump in the number of students at the college.

`-` Vì rocket = soar = leap = jump: đều chỉ xu hướng tăng mạnh.

`-` Cấu trúc này phổ biến trong Ielts: 

`-` S+ V+ adv+ number+ Time.

`-` There was/ were+ a/ an+ adj+ N+ giới từ+ number+ in+ S(chủ thể ban đầu)+ Time.

`-` S+ saw/ witnessed+ experienced+  a/ an+ adj+ N+ giới từ+ number+ time.

`-` A/ An+ adj+ N+ giới từ+ number+ be+ seen/ witnessed+ in+ S(chủ thể ban đầu)+ Time.

`-` Time+ witness/ saw+ a/ an+ adj+ N+ giới từ+ number+ in+ S(chủ thể ban đầu).
`3.` I find it very difficult to understand the work of that artist. DIFFICULTY

`to` I have great difficulty in understanding the work of the artist.

`-` Ta có thể làm theo cách khác nếu không dùng difficulty: 

`to` I have great trouble in understanding the work of the artist.

`to` I have great problem in understanding the work of the artist.

`-` Vì difficulty = trouble = problem: đều chỉ đến sự khó khắn, vấn đề. 

`-` Ta dựa vào: I find it very difficult to understand the work of that artist.

`-` difficult là adj `to` difficulty là N.

`-` Câu dưới: great là adj `to` ta sẽ đặt difficulty là N vào sau.

`-` Sau giới từ+ V-ing.
`4.` I am sure it was a disappointment to you that you missed the concert. DISAPPOINTED

`to` I am sure you were disappointed to miss the concert.

`-` Ta có thể làm như sau:

`-` I am sure `to` Ta vẫn viết lại.

`-` disappointment là N `to` disappointed là adj.

`-` Ta sẽ dùng vế sau để viết:

`-` S+ be+ adj+ to V.

`-` Mà câu đề đang dùng QKĐ `to` Ta vẫn dùng thì QKĐ.

1. There is no comparison between these two artists.

CT: not compare st= there be no comparison between st: không thể so sánh cái gì= không có sự so sánh giữa 2 cái gì.

2. There was an increase in the number of students at the college.

CT: Increase in st: sự gia tăng cái gì.

3. I have great difficulty in understanding the work of the artist.

CT: have difficulty/trouble in Ving: gặp khó khăn strong việc gì.

4. You must have been disappointed that you missed the concert.

CT: MUST + HAVE + P2 : chắc là đã, hẳn là đã, mức độ chắc chắn gần như 100%, chỉ một kết luận logic dựa trên những hiện tượng có đã xảy ra ở quá khứ

( Ôi cái đầu, câu cuối khó quá) CHÚC HỌC TỐT