do I combine? do you combine? does he combine? do we combine? do you combine? do they combine?
Present continuous
am I combining? are you combining? is he combining? are we combining? are you combining? are they combining?
Preterite
did I combine? did you combine? did he combine? did we combine? did you combine? did they combine?
Preterite continuous
was I combining? were you combining? was he combining? were we combining? were you combining? were they combining?
Present perfect
have I combined? have you combined? has he combined? have we combined? have you combined? have they combined?
Present perfect continuous
have I been combining? have you been combining? has he been combining? have we been combining? have you been combining? have they been combining?
Pluperfect
had I combined? had you combined? had he combined? had we combined? had you combined? had they combined?
Pluperfect continuous
had I been combining? had you been combining? had he been combining? had we been combining? had you been combining? had they been combining?
Future
will I combine? will you combine? will he combine? will we combine? will you combine? will they combine?
Future continuous
will I be combining? will you be combining? will he be combining? will we be combining? will you be combining? will they be combining?
Future perfect
will I have combined? will you have combined? will he have combined? will we have combined? will you have combined? will they have combined?
Future perfect continuous
will I have been combining? will you have been combining? will he have been combining? will we have been combining? will you have been combining? will they have been combining?
Conditional
Present
would I combine? would you combine? would he combine? would we combine? would you combine? would they combine?
Present continuous
would I be combining? would you be combining? would he be combining? would we be combining? would you be combining? would they be combining?
Past
would I have combined? would you have combined? would he have combined? would we have combined? would you have combined? would they have combined?
Past continuous
would I have been combining? would you have been combining? would he have been combining? would we have been combining? would you have been combining? would they have been combining?