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 couldn't boast you couldn't boast he 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 he 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 he 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 he 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 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
couldn't I boast? couldn't you boast? couldn't he 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 he 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 he 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 he have been boasting? couldn't we have been boasting? couldn't you have been boasting? couldn't they have been boasting?