“My sister can writes English letters now.”其中有一次错误,是哪一处?

问题描述:

“My sister can writes English letters now.”其中有一次错误,是哪一处?

my sister can write english letters now

write 后不加 s
can 后面只跟动词原形

can是助词,后面只能加动词原形.
所以can writes 要改成can write
Do you understand?