subject + modal + be + 1 > "ing"

1

3

go

gone

I can be going

I can't be going

Can I be going ?

I could be going

I couldn't be going

Could I be going ?

I may be going

I may not be going

May I be going ?

I might be going

I might not be going

Might I be going ?

I must be going

I mustn't be going

Must I be going ?

I should be going

I shouldn't be going

Should I be going ?

Affirmative

subject + modal + be + 1 > "ing"

I can be going to New York - Puedo estar yendo a NY (posib. física, conocimiento)

I could be going to New York - Podría estar yendo a NY (alternativa)

I may be going to New York - Puedo estar yendo a NY (permiso)

I might be going to New York - Podría estar yendo a NY (posibilidad)

I must be going to New York - Debo estar yendo a NY (obligación)

I should be going to New York - Debería estar yendo a NY (oblig. moral, consejo)

Negative

subject + modal + not be + 1 > "ing"

I can't be going to New York - No puedo estar yendo a NY

I couldn't be going to New York - No podría estar yendo a NY

I may not be going to New York - No puedo estar yendo a NY

I might not be going to New York - No podría estar yendo a NY 

I mustn't  be going to New York - No debo estar yendo a NY 

I shouldn't be going to New York - No debería estar yendo a NY 

Interrogative

modal + subject + be + 1 > "ing" ?

Can I be going to New York ? - ¿Puedo estar yendo a NY ?

Could I be going to New York ? - ¿Podría estar yendo a NY ?

May I be going to New York ? - ¿Puedo estar yendo a NY?

Might I be going to New York ? - ¿Podría estar yendo a NY ?

Must I be going to New York ? - ¿Debo estar yendo a NY ?

Should I be going to New York ? - ¿Debería estar yendo a NY ?