If more time given we can do it betterI ____(hear) him ___(sing) this song at that time.she ____(see)____(take)a walk by me yesterday.she ____(see)____(take)a walk by me this time yesterday.they ____(notice)____(hang) out two hours ago.I _____(often tell) ____(listen) to the teacher carefully in class.my mother often ———（make）me ——（do） 12 hours one day.幫一下忙I was hearinghim sing this song at that time.感覺這道題有歧義，就看你怎么理解at that time 了she was seen take a walk by me yesterday.she was seen taking a walk by me this time yesterday.這兩道題我也覺得沒什么意義，本來我上一道填的是taking，但為了和這道題的this time 所區(qū)分才選成take。語法上來講都是沒錯(cuò)的，重要的是你能理解see sb. do sth.和see sb. doing sth.的區(qū)別就行了they were noticed hanged out two hours ago.這里hang我理解成了吊死。I am often told to listening to the teacher carefully in class.my mother oftenmakes me do（do what？）12 hours one day.