English verb conjugation
CAN SIGNAL

Regular verb: signal - signalled - signalled

Affirmation

Simple form	V-ing form
I can signal you can signal he can signal we can signal you can signal they can signal	I can be signalling you can be signalling he can be signalling we can be signalling you can be signalling they can be signalling
Perfect	V-ing perfect
I can have signalled you can have signalled he can have signalled we can have signalled you can have signalled they can have signalled	I can have been signalling you can have been signalling he can have been signalling we can have been signalling you can have been signalling they can have been signalling

Negation

Simple form	V-ing form
I cannot signal you cannot signal he cannot signal we cannot signal you cannot signal they cannot signal	I cannot be signalling you cannot be signalling he cannot be signalling we cannot be signalling you cannot be signalling they cannot be signalling
Perfect	V-ing perfect
I cannot have signalled you cannot have signalled he cannot have signalled we cannot have signalled you cannot have signalled they cannot have signalled	I cannot have been signalling you cannot have been signalling he cannot have been signalling we cannot have been signalling you cannot have been signalling they cannot have been signalling

Interrogative form

Simple form	V-ing form
can I signal? can you signal? can he signal? can we signal? can you signal? can they signal?	can I be signalling? can you be signalling? can he be signalling? can we be signalling? can you be signalling? can they be signalling?
Perfect	V-ing perfect
can I have signalled? can you have signalled? can he have signalled? can we have signalled? can you have signalled? can they have signalled?	can I have been signalling? can you have been signalling? can he have been signalling? can we have been signalling? can you have been signalling? can they have been signalling?

Interro-negative form

Simple form	V-ing form
can I not signal? can you not signal? can he not signal? can we not signal? can you not signal? can they not signal?	can I not be signalling? can you not be signalling? can he not be signalling? can we not be signalling? can you not be signalling? can they not be signalling?
Perfect	V-ing perfect
can I not have signalled? can you not have signalled? can he not have signalled? can we not have signalled? can you not have signalled? can they not have signalled?	can I not have been signalling? can you not have been signalling? can he not have been signalling? can we not have been signalling? can you not have been signalling? can they not have been signalling?