Modal verbs

Well, the principal action verb will be after the modal verb and will always be in its basic form.

IN AN AFFIRMATIVE SENTENCE:

Modal verbs will be written after the subject and before the principal action verb:

They must be inside! the storm is comming.

IN A NEGATIVE SENTENCE:

Modal verbs will be written after the subject and before the not and the principal action verb:

You should´t (Should not) travel to China because of the pandemic.

IN AN INTERROGATIVE SENTENCE:

The modal verb will start the sentence and it goes before the subject and the action verb:

Can you help me please?