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