Usage of MUST, HAVE TO, and HAVE GOT TO

MUST, HAVE TO, HAVE GOT TO

MUST,HAVE TO, DAN HAVE GOT TO adalah model yang menyatakan keharusan/kewajiban dalam melakukan sesuatu.
Contoh :
I must/have to arrive at aschool at 7 : 00 
kalimat tersebut menyatakan keharusan bahwa “saya harus sampai di sekolah jam 7” Tidak ada pilian lain, jika tidak saya akan terlambat.
Dalam keseharian HAVE TO lebih sering dipakai daripada MUST. Must biasanya lebih kuat dari HAVE TO. MUST mengindikasaikan keharusan yang sangat penting,sesuatu itu harus dilakukan TIDAK BISA dilewatkan/dilanggar/ditunda.
Contoh :
(a)i’m looking for adi. I have to talk to him about our dinner time tonight. I can’t meet him for dinner because i have to go to a business meeting at 8 : 00 PM.
(b)Where’s adi ? i must talk to him right away. I have an urgent message for him.

Di (a) the speaker simply saying “ I need to do this, and I need to do that.
In (b) the speaker strongly saying “ This is very important.”

Dalam kalimat kita boleh memilih menggunakan HAVE TO atau  HAVE GOT TO, tapi HAVE GOT TO jarang digunakan dalam kaliamat. HAVE GOT TO lebih sering digunakan dalam speaking.

Dalam rumus MUST, HAVE TO, and HAVE GOT TO. selalu diikutu oleh Verb1(infinitive)
Present :
S + Have to,  have got to, must + V1 (infinitive)
Past tense :
S + Had to, had got to, *must + V1 (infinitive)
Note : *must tidak memiliki bentuk lampau.
Negative Form
HAVE TO :
S + don’t have to + V1
Contoh : tommorrow is holiday so, I don’t  have to come to class.
Kita tidak bisa menggunakan have not to dlam kalimat

MUST :
S + must not + V1
You must not play with knife, you can hurt someone.