1. He grew a lot last year.

2. He grew slightly last year.
3. He grew much last year.
4. He grew a little last year.
5. He grew in a medium degree last year.

(Are the expressions grammatical? Would you mame more expressions similar to them?)

Numbers 3 and 5 are not generally used. The others are grammatical. \

You can also say, He is much taller than he was last year. He is not much taller than he was last year. He is just a little taller than he was.

1. Yes, the expression "He grew a lot last year" is grammatical and means that he experienced significant growth or development in the past year.

2. Similarly, the expression "He grew slightly last year" is also grammatical. It suggests that there was a small amount of growth or development, but not as much as in the first example.

3. The expression "He grew much last year" is not grammatical. A more correct way to express this would be "He grew a lot last year" (as mentioned in the first example), which conveys the same meaning.

4. The expression "He grew a little last year" is grammatical and means that there was a small amount of growth or development, similar to the second example.

5. The expression "He grew in a medium degree last year" is not commonly used in English. Instead, you can use phrases like "He grew moderately last year" or "He experienced moderate growth last year" to convey that there was a respectable or average amount of growth.

Here are a few more expressions that are similar in meaning:

6. He grew significantly last year.
7. He experienced substantial growth last year.
8. He made considerable progress last year.
9. He had noticeable development last year.
10. He improved noticeably last year.