English verb conjugation
COULD SHUTTLE

Regular verb: shuttle - shuttled - shuttled

Affirmation

Simple form	V-ing form
I could shuttle you could shuttle she could shuttle we could shuttle you could shuttle they could shuttle	I could be shuttling you could be shuttling she could be shuttling we could be shuttling you could be shuttling they could be shuttling
Perfect	V-ing perfect
I could have shuttled you could have shuttled she could have shuttled we could have shuttled you could have shuttled they could have shuttled	I could have been shuttling you could have been shuttling she could have been shuttling we could have been shuttling you could have been shuttling they could have been shuttling

Negation

Simple form	V-ing form
I couldn't shuttle you couldn't shuttle she couldn't shuttle we couldn't shuttle you couldn't shuttle they couldn't shuttle	I couldn't be shuttling you couldn't be shuttling she couldn't be shuttling we couldn't be shuttling you couldn't be shuttling they couldn't be shuttling
Perfect	V-ing perfect
I couldn't have shuttled you couldn't have shuttled she couldn't have shuttled we couldn't have shuttled you couldn't have shuttled they couldn't have shuttled	I couldn't have been shuttling you couldn't have been shuttling she couldn't have been shuttling we couldn't have been shuttling you couldn't have been shuttling they couldn't have been shuttling

Interrogative form

Simple form	V-ing form
could I shuttle? could you shuttle? could she shuttle? could we shuttle? could you shuttle? could they shuttle?	could I be shuttling? could you be shuttling? could she be shuttling? could we be shuttling? could you be shuttling? could they be shuttling?
Perfect	V-ing perfect
could I have shuttled? could you have shuttled? could she have shuttled? could we have shuttled? could you have shuttled? could they have shuttled?	could I have been shuttling? could you have been shuttling? could she have been shuttling? could we have been shuttling? could you have been shuttling? could they have been shuttling?

Interro-negative form

Simple form	V-ing form
couldn't I shuttle? couldn't you shuttle? couldn't she shuttle? couldn't we shuttle? couldn't you shuttle? couldn't they shuttle?	couldn't I be shuttling? couldn't you be shuttling? couldn't she be shuttling? couldn't we be shuttling? couldn't you be shuttling? couldn't they be shuttling?
Perfect	V-ing perfect
couldn't I have shuttled? couldn't you have shuttled? couldn't she have shuttled? couldn't we have shuttled? couldn't you have shuttled? couldn't they have shuttled?	couldn't I have been shuttling? couldn't you have been shuttling? couldn't she have been shuttling? couldn't we have been shuttling? couldn't you have been shuttling? couldn't they have been shuttling?