The boys all went swimming after school.

熱心網友

No.There are some grammar mistakes in this sentence.You can correct it into"All of the boys went siwmming after school.".

熱心網友

No problem.the可以用在句中表特指,應該是沒問題的.

熱心網友

我覺得這句話可以

熱心網友

覺得還是不要用 the 吧。可以說 Boys all...如果要特指，可以用 Those boys all...