改错
First of all,I should explain that althoughI can swim,I am 1_____
very much confident in water.You mentioned all your trainers 2_____
have a lot of experiences in training.So I believe 3________
they will able to teach someone like me to dive.I have one week's 4_____
holiday in the three week of June and would like to 5______
konw if there's a course running at that time.How much 6_______
do a week's courses spend?Finally,if I decide to go ahead, 7_______
are there any special equipment I need to buy? 8____
(有七处错误)

1. 加 not, 即 not very much confident in water
2. experience 在这里不可数， 去掉复数
3. 加 be, 即 they will be able to teach
4. three 改成 third
5. know 不是 konw
6. how much does a week's course cost? (也许你们老师就想让你改spent为cost，但是 a week's courses 实在奇怪)
8. equipments 加复数

好像7.也有点问题，但是说得过去啦。