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