✨ ベストアンサー ✨
[2]
1. 〇
2. 〇
3. would
4. 〇
5. had better ※had better ~ ~した方がいい
[3]
1. 〇
2. 〇
3. 〇
4. I [should have brought] my umbrella with me.
[4]
1. [Will you get me] some pens at the convenience store? ※Will you ~? ~しれくれませんか?<依頼>
2. My sister [may have gone] to bed. ※may have ~ed ~したかも知れない
3. 〇
4. 〇
5.She [can't have said] such a thing. ※can't/cannot have ~ed ~したはずがない
参考にしてください。
You're welcome!😊
ありがとうございます!