[ Grammar ]
The first electric lamp had two carbon rods from which vapor serves to conduct the current across the gap.
A. The first
B. which
C. serves
D. to conduct
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Grammar - Present Perfect TenseCity PlacesQuantifiers & Modal VerbsDirect and Indirect SpeechAdjective and AdverbSentences and Non SentencesIdentifying Sentence TypesInterjections, Tag Questions and Nouns of Direct AddressPast Simple - Present PerfectSimple Present and Past TensesOther quiz:
Grammar › ViewWhat ______ your sister’s friend do in the afternoon?
A. do
B. does
C. am
D. is
Verb Tenses › View
Use a time expression with present perfect tense.
A. I am studying English for five years.
B. I studied English for five years.
C. I will study English for five years.
D. I have been studying English for five years.
Grammar › ViewMy mother told me to __________ on warm clothes before I went out.
A. get
B. taking
C. have
D. put
a, an, the, Zero Article › View
Which article correctly completes each sentence?
Did Ranita ____frog really sleep in Félipé’s bed?
A. A
B. An
C. The