English verb conjugation
CAN TIP

Regular verb: tip - tipped - tipped

Affirmation

Simple form	V-ing form
I can tip you can tip he can tip we can tip you can tip they can tip	I can be tipping you can be tipping he can be tipping we can be tipping you can be tipping they can be tipping
Perfect	V-ing perfect
I can have tipped you can have tipped he can have tipped we can have tipped you can have tipped they can have tipped	I can have been tipping you can have been tipping he can have been tipping we can have been tipping you can have been tipping they can have been tipping

Negation

Simple form	V-ing form
I cannot tip you cannot tip he cannot tip we cannot tip you cannot tip they cannot tip	I cannot be tipping you cannot be tipping he cannot be tipping we cannot be tipping you cannot be tipping they cannot be tipping
Perfect	V-ing perfect
I cannot have tipped you cannot have tipped he cannot have tipped we cannot have tipped you cannot have tipped they cannot have tipped	I cannot have been tipping you cannot have been tipping he cannot have been tipping we cannot have been tipping you cannot have been tipping they cannot have been tipping

Interrogative form

Simple form	V-ing form
can I tip? can you tip? can he tip? can we tip? can you tip? can they tip?	can I be tipping? can you be tipping? can he be tipping? can we be tipping? can you be tipping? can they be tipping?
Perfect	V-ing perfect
can I have tipped? can you have tipped? can he have tipped? can we have tipped? can you have tipped? can they have tipped?	can I have been tipping? can you have been tipping? can he have been tipping? can we have been tipping? can you have been tipping? can they have been tipping?

Interro-negative form

Simple form	V-ing form
can I not tip? can you not tip? can he not tip? can we not tip? can you not tip? can they not tip?	can I not be tipping? can you not be tipping? can he not be tipping? can we not be tipping? can you not be tipping? can they not be tipping?
Perfect	V-ing perfect
can I not have tipped? can you not have tipped? can he not have tipped? can we not have tipped? can you not have tipped? can they not have tipped?	can I not have been tipping? can you not have been tipping? can he not have been tipping? can we not have been tipping? can you not have been tipping? can they not have been tipping?