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