do I modify? do you modify? does she modify? do we modify? do you modify? do they modify?
Present continuous
am I modifying? are you modifying? is she modifying? are we modifying? are you modifying? are they modifying?
Preterite
did I modify? did you modify? did she modify? did we modify? did you modify? did they modify?
Preterite continuous
was I modifying? were you modifying? was she modifying? were we modifying? were you modifying? were they modifying?
Present perfect
have I modified? have you modified? has she modified? have we modified? have you modified? have they modified?
Present perfect continuous
have I been modifying? have you been modifying? has she been modifying? have we been modifying? have you been modifying? have they been modifying?
Pluperfect
had I modified? had you modified? had she modified? had we modified? had you modified? had they modified?
Pluperfect continuous
had I been modifying? had you been modifying? had she been modifying? had we been modifying? had you been modifying? had they been modifying?
Future
will I modify? will you modify? will she modify? will we modify? will you modify? will they modify?
Future continuous
will I be modifying? will you be modifying? will she be modifying? will we be modifying? will you be modifying? will they be modifying?
Future perfect
will I have modified? will you have modified? will she have modified? will we have modified? will you have modified? will they have modified?
Future perfect continuous
will I have been modifying? will you have been modifying? will she have been modifying? will we have been modifying? will you have been modifying? will they have been modifying?
Conditional
Present
would I modify? would you modify? would she modify? would we modify? would you modify? would they modify?
Present continuous
would I be modifying? would you be modifying? would she be modifying? would we be modifying? would you be modifying? would they be modifying?
Past
would I have modified? would you have modified? would she have modified? would we have modified? would you have modified? would they have modified?
Past continuous
would I have been modifying? would you have been modifying? would she have been modifying? would we have been modifying? would you have been modifying? would they have been modifying?