Confusing English Words – have to / must / need to

بسیاری از کلمات وجود دارند که معنی یکسانی دارند، اما در واقع تعاریف و کاربردهای مختلفی دارند.
شما می خواهید درست صحبت کنید و از به کار بردن کلمات نادرست خودداری کنید، اما در مورد معنی دقیق و کاربرد هر کلمه کاملا مطمئن نیستید.
بعضی از زبان آموزان حتی به دلیل تردیدهایشان از به کار بردن کلمات خودداری می کنند!
هدف ما در این سری از پست ها روشن کردن رایج ترین کلمات گیج کننده در انگلیسی است.

have to / must / need to

.These words are all used for obligations – things that are necessary and required

:Must is the most formal. It is usually used in official rules (and is not as common in spoken English)

.Students must register for classes by August 1
.You must possess a valid driver’s license to apply for this job

!NEVER use the word “to” after must. “Must to” does not exist

:In everyday English, need to, have to, and got to (informal) are more common ways of expressing obligations

.We need to buy some milk – there’s none in the refrigerator
.My son needs to get a haircut; his hair is getting really long
.I have to leave work early today in order to pick up my kids from school
.Sarah works at a restaurant, so she has to work nights and weekends
.We’ve been really stressed out lately; we gotta (got to) take a vacation

:When talking about actions you need to do, ALWAYS use the word “to” after need/have and before the verb

.We need buy some milk
.I have leave work early

:When spoken fast

need to sounds like needa
needs to sounds like needsta
have to sounds like hafta
has to sounds like hasta
got to sounds like gotta

Be careful when using the negative form. Mustn’t is different from “don’t need to” and “don’t have to.” Mustn’t means something is prohibited/forbidden, but “don’t need to” and “don’t have to” mean something is not required; it is optional

.You mustn’t smoke inside the hospital
.You don’t need to buy a ticket; the concert is free
.You don’t have to go to the extra review session; it’s an optional class