English verb conjugation
COULD BOAST

Regular verb: boast - boasted - boasted

Affirmation

Simple form	V-ing form
I could boast you could boast he could boast we could boast you could boast they could boast	I could be boasting you could be boasting he 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 he 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 he 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 could not boast you could not boast he could not boast we could not boast you could not boast they could not boast	I could not be boasting you could not be boasting he could not be boasting we could not be boasting you could not be boasting they could not be boasting
Perfect	V-ing perfect
I could not have boasted you could not have boasted he could not have boasted we could not have boasted you could not have boasted they could not have boasted	I could not have been boasting you could not have been boasting he could not have been boasting we could not have been boasting you could not have been boasting they could not have been boasting

Interrogative form

Simple form	V-ing form
could I boast? could you boast? could he boast? could we boast? could you boast? could they boast?	could I be boasting? could you be boasting? could he 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 he 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 he 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
could I not boast? could you not boast? could he not boast? could we not boast? could you not boast? could they not boast?	could I not be boasting? could you not be boasting? could he not be boasting? could we not be boasting? could you not be boasting? could they not be boasting?
Perfect	V-ing perfect
could I not have boasted? could you not have boasted? could he not have boasted? could we not have boasted? could you not have boasted? could they not have boasted?	could I not have been boasting? could you not have been boasting? could he not have been boasting? could we not have been boasting? could you not have been boasting? could they not have been boasting?