I don't ski you don't ski he doesn't ski we don't ski you don't ski they don't ski
Present continuous
I'm not skiing you aren't skiing he isn't skiing we aren't skiing you aren't skiing they aren't skiing
Preterite
I didn't ski you didn't ski he didn't ski we didn't ski you didn't ski they didn't ski
Preterite continuous
I wasn't skiing you weren't skiing he wasn't skiing we weren't skiing you weren't skiing they weren't skiing
Present perfect
I haven't skied you haven't skied he hasn't skied we haven't skied you haven't skied they haven't skied
Present perfect continuous
I haven't been skiing you haven't been skiing he hasn't been skiing we haven't been skiing you haven't been skiing they haven't been skiing
Pluperfect
I hadn't skied you hadn't skied he hadn't skied we hadn't skied you hadn't skied they hadn't skied
Pluperfect continuous
I hadn't been skiing you hadn't been skiing he hadn't been skiing we hadn't been skiing you hadn't been skiing they hadn't been skiing
Future
I won't ski you won't ski he won't ski we won't ski you won't ski they won't ski
Future continuous
I won't be skiing you won't be skiing he won't be skiing we won't be skiing you won't be skiing they won't be skiing
Future perfect
I won't have skied you won't have skied he won't have skied we won't have skied you won't have skied they won't have skied
Future perfect continuous
I won't have been skiing you won't have been skiing he won't have been skiing we won't have been skiing you won't have been skiing they won't have been skiing
Conditional
Present
I wouldn't ski you wouldn't ski he wouldn't ski we wouldn't ski you wouldn't ski they wouldn't ski
Present continuous
I wouldn't be skiing you wouldn't be skiing he wouldn't be skiing we wouldn't be skiing you wouldn't be skiing they wouldn't be skiing
Past
I wouldn't have skied you wouldn't have skied he wouldn't have skied we wouldn't have skied you wouldn't have skied they wouldn't have skied
Past continuous
I wouldn't have been skiing you wouldn't have been skiing he wouldn't have been skiing we wouldn't have been skiing you wouldn't have been skiing they wouldn't have been skiing