I give it 3 stars! If it had a happy ending, I'd give it 4 stars!
I rate it 3 stars! / I give it a 3-star rating!
We use the verb "give" and "rate" in this case.
A: How did you like the movie?
B: I give it 4 stars!
A: How do you rate the movie?
B: I rate it 4 stars.
A: How did you like the movie?
B: It's a 3-star movie.
この場合、動詞の "give" と "rate" が使われます。
A: How did you like the movie?(映画どうでしたか)
B: I give it 4 stars!(四ツ星です)
A: How do you rate the movie?(映画どうでしたか)
B: I rate it 4 stars.(四ツ星です)
A: How did you like the movie?(映画どうでしたか)
B: It's a 3-star movie.(三ツ星映画です)