なぜopenでなくis openなのか教えてください🙏

私はこのレストランがいつ開いているのかわかりません。 (don't know / open / I/ when/is/ this restaurant / .) I don't know when this restaurant is open.

d で始まる単語を答える問題です わかる方お願いします

A: The boat is starting to ( ) away from the shore. B: Oh no! We need to catch it before it floats away!

a で始まる単語を答える問題です わかる方お願いします

In the meeting, a group of experts discussed the effects of economic activities that ( ) global warming.

関係代名詞の主格、所有格、目的格を見分けるのが難しいです💧良い方法あれば教えてください🙏

書き換えを教えてください よろしくお願いします

Mr. and Mrs. Smith got married twenty years ago. = Mr. and Mrs. Smith ( married ( ) ( ) ) twenty years.

書き換えを教えてください よろしくお願いします

It doesn't snow at all in Australia. = We ( Australia. ) ( ) ( ) snow in

書き換えを教えてください よろしくお願いします

My brother's birthday is September 18th. = My brother ( September 18th. ) ( ) ( )

How many fish did you catch? とありますが、なぜfishは複数形ではないんですか？説明をお願いします🙇

答えはどれでしょうか？

I ( ) that to her last night if I had known her present circumstances. ① hadn't said 3 would not have said 2 won't say 4) wouldn't say

答えはどれでしょうか？

I ( 1 am not ) surprised if he said so. (2) wasn't 3) won't be 4) wouldn't be