英语怎么说,"要做的一些练习"

You need to do some exercises.

Exercise 确实可数，加拿大的数学课本上就用了这个词

have to 显得太过於强烈，“你必须要做一些练习”

而 need to 表示了需要做的

要做的一些练习 the exercises that you have to do
"戴眼镜的学生们 the students with glasses

have to do some exercises

have to do some exercise
exercise 不可数,不用加's'
戴眼镜的学生们: students wearing glasses
英语跟汉语不一样,不用'的'

do some exercises

或直接 do exercises

exercises we are going to finish

exersises (we have) to do

students who wear glasses