英文10..............

Actually, there are lots of answers which are acceptable. Some of them are listed below:

1. ... but usually, people do not meet their pen friends easily ...
2. ... but usually, people cannot meet their pen firends ...
3. ... but usually, people did not meet their pen friends easily in the past ...

Which one of the above you choose depends on what you really want to say.

這句句子在前面就用現在式,
所以後面都要用現在式........
所以要改成but usually ,people donot meet their pen friends .

有usually..就唔會係did..應該係present tense

but usually,poeple WILL not meet their pen friends

Verb after "usually" have to be in present tense. So you should write : "But usually, people DO not meet their pen friends."