Need to（需要）vs Have to（必须）

You have to eat vegetables. Use have to To have, present simple tense + infinitive without to (here, to eat) to express an obligation. Example: you have to exercise more.

(To) have means to possess and we do not use it right before an infinitive without to (here, eat). Example: I have a nice room.

You could say you need to eat vegetables to express a necessity, but in this sentence to is missing.

He needs to stop, with needs to to express a necessity. Example: I need to go on holiday!

We could say I need to stop, but since the subject is he, we have to use needs with an -s at the end.

A needle is used for sewing… and not in this sentence! Example: I need a needle to sew on a button.

Guests don't have to clean their rooms, with the negative form don't have to because guests are not required to clean their rooms. Example: you don't have to work until late.

You could say, for example, the guests haven't got their room key, but we generally don't use the negative form with got to talk about obligations.

You could say there is no need to clean your room (=it is not necessary to clean your room), but you cannot use this expression after guests.

Caroline has to cook To have, present simple tense, which means that Caroline has an obligation to cook. Note: remember that the verb to have is irregular.Example: Roger has to work 8 hours a day.

You could say I have to cook, but since the subject here is Caroline (=she), the verb to have becomes has To have, present simple tense.

🎵 Heaven, I'm in Heaven… 🎵 Maybe you like Fred Astaire too much… Unfortunately, this is not how we complete this sentence!

We need to go home. Use need to to express a necessity. Example: they need to finish earlier.

You could say we need some help, with need + noun (some help) to talk about what you require, but here you also need the word to before the verb go.

You could say we don't need to go home, but to is missing in this option.

Do you have to inform them? When forming a question, have to follows the same rules as any other verb, so follow the structure: do + subject (you) To do, question + modal verb (have to) + infinitive without to (inform). Example: do you have to send him a report?

You could say you have to inform them in the affirmative form, but this sentence is a question.

You could say you have to do your chores with have to + the verb do, but here we already have the verb inform, so we cannot add another infinitive without to.

Magda has to check the guests' passports, with has to To have, present simple tense to express Magda's obligation. Example: Timmy has to call his mother every day.

A hassle is an inconvenience… but not a word you can use in this sentence.

You could say the receptionists (=they) have to check the guests' passports, but when the subject is he/she/it (here, Magda=she), the verb to have becomes has.

-Do they need to leave tonight? -No, they don't. Use the interrogative form do they need to to ask about a requirement or a necessity. Example: do we need to go?

You could say they need to leave tonight in the affirmative form (a statement), but this sentence is a question.

They need to leave tonight is a statement in the affirmative form, but this sentence is a question.

I need to have a break expresses a necessity to have a break. Example: I need to drink some water.

To need is the infinitive form of the verb, but here we have to use need to. Example: it is common to need help from friends.

You could say Caroline (=she) needs to have a break with needs (ending in -s) since the subject is Caroline, but we don't add an -s at the end of the verb when the subject is I.