Please read one sentence at a time, then I'll repeat after you.
If you read one sentence, I'll say it after you, then we'll just keep going like that.
ーPlease read one sentence at a time, then I'll repeat after you.
「一文ずつ読んでください、そのあと私が繰り返します」
read one sentence at a time で「一文ずつ読む」
repeat after you で「あなたのあとに繰り返す」
ーIf you read one sentence, I'll say it after you, then we'll just keep going like that.
「一文読んでくれたら、あなたのあとにそれを言います。そのように続けましょう」
keep going like that で「そのように続ける」
ご参考まで！
カナダ 
