英文 Grammar 的問題

1. it is because it is a 3rd person
2. because we is plural
3. because it present continous tense

1) We use "DOSEN'T" because a liar is only one person.The word "DOESN'T" refers to
the person.
e.g) He doesn't like doing homework.
2)"WE ARE NOT GROWING" IS USING PRESENT CONTINOUS TENSE
e.g) I am doing my homework.
e.g) We do not GROW any fruit in the garden. (PRESENT TENSE)
3) "ISN'T WORK" ???
I think you mean "isn't working " ???typing mistakes???
the explanation is the same in 2)

It's good that you ask for help to improve your Enlish .ADD OIL~~

1.) a liar ，一個說謊者，講到明係一個，仲要係第三身單數，又點會用don't 呢？?

2.) 英文文法，有好多野都冇得解釋，例如：點解he 一定要跟is，~ a, e, i, o, u做字頭ge 英文前面都要用an呢？? (an apple)...當然，如果呢題你將we are not growing 改做we do not grow 都冇問題嫁！意思一樣~

3.) 同上，你將佢改用don't 都係冇問題，變做he do not have to work.
但係都有例外，
He isn't work at this company.同 He do not have to work at this company.
呢兩句ge 意思就唔同啦，前面o個句係話『他不是在這間公司工作』，
另一句就係話『他不用在這間公司工作』~
我唔知你係咪中國人啦...不是、不用，已經有好大分別！~