I don’t know how to ski, so I didn’t go skiing with Simon last week.
A. If I knew how to ski, I would go skiing with Simon last week.
B. If I would know how to ski, I would have gone skiing with Simon last week.
C. If I had known how to ski, I gone skiing with Simon last week.
D. If I knew how to ski, I would have gone skiing with Simon last week.

Random Topics:
Simple and Progressive Verb TensesInfinitives or GerundsPresent simple & ContinuousThe -ing Form of VerbsPast Tense & Present Perfect TenseComplex Sentences with Adverb ClausesDependent PrepositionsSimple, Compound, Complex SentencesPronoun-Verb AgreementGrammar MistakesOther quiz:
Grammar › Viewopen the door, …?
A. will you?
B. won’t you?
C. shall we?
Tenses › View
Sally _____really hard for her exams this week.
A. takes
B. will be taking
C. is taking
D. had taken
Vocabulary › View Ryder’s first job as superintendent of the Kadoka Area School District was to make the dress code uniform in all 4 schools.
A. The same
B. Public
C. Proper
D. Lower
Present Tenses › View
Taylor: … your brother talked to you yet? Susan: Yes, he ….
A. Has / did
B. Have / have
C. Has / has
D. Did/did