Modals Verbs

1. Express

1.1. ability

1.1.1. Example: I can speak english

1.2. Possibility

1.2.1. Example: I think I could get ten

1.3. Need

1.3.1. Example: You must eat to not get sick

1.4. suggestions

1.4.1. Example: You shall recharge your phone to talk

2. they are auxiliary verbs; they do not work as a main verb

3. Basic rules

3.1. Use as is- don´t change

3.1.1. Example: He can read (correct) He cans read (Incorrect)

3.2. Use base verb after modal future don´t use "to"

3.2.1. Example: He might join us (correct) He might to join us (Incorrect)

3.3. Use "not" after modals- do not use do not, does not, is not, are not,was not,wo not

3.3.1. Example: You should not smoke (correct) You do not should smoke ( Incorrect)

3.4. No "ing", "ed" or "s" are added

3.4.1. Example: Coulding (Incorrect) Could (correct); Shalled (Incorrect) Shall (correct) Cans (Incorrect) Can (correct)