Which sentence correctly uses ‘be able to’ in the past tense?
A. I am able to solve the problem yesterday.
B. I was able to solve the problem yesterday.
C. I will be able to solve the problem yesterday.
D. I have been able to solve the problem yesterday.

Random Topics:
Present and Past TensesArgumentative VocabularyPaired ConjunctionAdjectives and PronounsPast Perfect SimpleIndefinite and Definite ArticlesMixed ConditionalsPrepositions after VerbsUsed to & would & Past SimplePreposition of TimeOther quiz:
Grammar - must & have to › ViewThe future tense of must is…
A. will must
B. must will
C. will have to
Tenses › View
What tense is the following sentence?
I’m opening my own kitchen at the moment.
A. Simple Past Tense
B. Present Perfect Tense
C. Present Continuous Tense
D. Past Continuous Tense
E. Simple Future Tense
Grammar › ViewChoose the sentence with correct comma usage.
A. My dear old grandfather who is seventy years old still jogs everyday.
B. My dear old grandfather ,who is seventy years old, still jogs everyday.
C. My dear old grandfather, who is seventy years old still jogs everyday.
Grammar › View
Our teacher has promised _______ us a documentary about whales.
A. showing
B. show
C. to show.