English verb conjugation
COULD BOAST

Regular verb: boast - boasted - boasted

Affirmation

Simple form	V-ing form
I could boast you could boast she could boast we could boast you could boast they could boast	I could be boasting you could be boasting she could be boasting we could be boasting you could be boasting they could be boasting
Perfect	V-ing perfect
I could have boasted you could have boasted she could have boasted we could have boasted you could have boasted they could have boasted	I could have been boasting you could have been boasting she could have been boasting we could have been boasting you could have been boasting they could have been boasting

Negation

Simple form	V-ing form
I couldn't boast you couldn't boast she couldn't boast we couldn't boast you couldn't boast they couldn't boast	I couldn't be boasting you couldn't be boasting she couldn't be boasting we couldn't be boasting you couldn't be boasting they couldn't be boasting
Perfect	V-ing perfect
I couldn't have boasted you couldn't have boasted she couldn't have boasted we couldn't have boasted you couldn't have boasted they couldn't have boasted	I couldn't have been boasting you couldn't have been boasting she couldn't have been boasting we couldn't have been boasting you couldn't have been boasting they couldn't have been boasting

Interrogative form

Simple form	V-ing form
could I boast? could you boast? could she boast? could we boast? could you boast? could they boast?	could I be boasting? could you be boasting? could she be boasting? could we be boasting? could you be boasting? could they be boasting?
Perfect	V-ing perfect
could I have boasted? could you have boasted? could she have boasted? could we have boasted? could you have boasted? could they have boasted?	could I have been boasting? could you have been boasting? could she have been boasting? could we have been boasting? could you have been boasting? could they have been boasting?

Interro-negative form

Simple form	V-ing form
couldn't I boast? couldn't you boast? couldn't she boast? couldn't we boast? couldn't you boast? couldn't they boast?	couldn't I be boasting? couldn't you be boasting? couldn't she be boasting? couldn't we be boasting? couldn't you be boasting? couldn't they be boasting?
Perfect	V-ing perfect
couldn't I have boasted? couldn't you have boasted? couldn't she have boasted? couldn't we have boasted? couldn't you have boasted? couldn't they have boasted?	couldn't I have been boasting? couldn't you have been boasting? couldn't she have been boasting? couldn't we have been boasting? couldn't you have been boasting? couldn't they have been boasting?