Modal verbs

It's compulsory/ mandatory/ obliged for sb to do sth.....=> ....

• Sb must do sth

• Sb mustn't do sth

• Sb need do sth

• Sb should do sth

It isn't compulsory/ mandatory/ obliged for sb to do sth.....=> ....

• Sb must do sth

• Sb mustn't do sth

• Sb needn't/ not have to do sth

• Sb should do sth

it is necessary for sb to do sth => .....

• Sb have/ has to do sth

• Sb need do sth

• Sb should do sth

• Sb must do sth

it is unnecessary/ not necessary for sb to do sth => .....

• Sb have/ has to do sth

• Sb need do sth

• Sb shouldn't do sth

• Sb needn't do sth

Maybe, sb will/ won't do sth. => .......

• Sb will/ won't do sth

• Sb should/ shouldn't do sth

• Sb may/ may not do sth

• Sb must/mustn't do sth

Perhaps, sb do sth. =>......

• Sb can do sth

• Sb need do sth

• Sb should do sth

• Sb may/ might do sth

Sb be allowed to do sth => ....

• Sb can do sth

• Sb will do sth

• Sb must do sth

• Sb have to do sth

Sb be not allowed/ permitted to do sth => ....

• Sb can't do sth

• Sb will not do sth

• Sb mustn't do sth

• Sb not have to do sth

I am sure sb do sth. => ......

• Sb should do sth

• Sb must do sth

• Sb may do sth

• Sb need do sth

It's possible that sb will do sth. =>....

• sb can do sth

• sb must do sth

• sb may do sth

• sb have to do sth