[ Tenses ]
They (walk) for four hours, so they are tired.
A. had been walking
B. were walking
C. have been walking
D. will have walk

Random Topics:
Identifying TensesGrammar and EssayConditional and SubjunctiveNouns and QuantifiersAdverbial ClausesPresent Perfect vs Past Simple TensePast ParticiplePast Tense & Past Continuous TensePresent and Past Simple TenseAdjectives and DegreesOther quiz:
Grammar › ViewChoose the correct word to complete the sentence: “I don’t have ___ time to study.”
A. much
B. many
C. some
D. any
Vocabulary, Grammar, Spelling › View
the repeating of sounds or movements to create a beat
A. instruments
B. rhythm
C. sounds
D. music
Simple Past Tense › ViewAlice’s parents _______________ in Singapore.
A. grew up
B. grown up
C. grow up
D. grows up
Adjective or Adverb › View
Patrick thinks that chocolate cake is … than banana cake.
A. delicious
B. more delicious
C. a more delicious
D. most delicious
E. a delicious
