Кароч, как будет правильнее?

Или оба варианта правильные, объясните почему

I've understood

I understood

Кароч, как будет правильнее? Или оба варианта правильные, объясните почему I've understood I understood Have I understand Am I understood - - - как здесь вопрос сделать?

Как сделать see-saw-seen 2 wear-?-worn 3?-struck-? 4 sraw-drew-? 5 Forget-?-forgotten 6?-understood-understood 7 grow-?-? fly-flew-?

Поставьте глаголы, данные в скобках в нужную форму. 1. If you (speak) slowly, he might have understood you. 2. I (take) a taxi if I had understood that it was too late. 3. If I (be) ready when he called, he would have taken me with him. 4.

Circle the correct answers. 1 I didn't recognize/hadn't recognized Helen, because she cut/had cut her hair very short. 2 No one understood/had understood how the cat got/had got into the car.

I dont know who ... chemistiry better than she does a) understood b) understand c) has understood d) understands