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