A verb phrase consists of a main verb and its auxiliaries. In this sentence, will have been studying is a combination of auxiliary verbs (will have been) and the main verb (studying), forming a future perfect continuous tense.
Options B and C both are correct because
the singular noun "cat" with the singular verb "sleeping"
the plural noun cat" with the plural verb "sleeping"
Note:
Subjects and verbs always have to agree with each other.
A singular subject must take a singular verb.
Know is a verb which means جاننا
Knew is the second form and known is the third form of know.
Past Indefinite tense
Active Voice= Subject + Second Form of Verb + Object.
Passive Voice = Object + was/were + third of verb + by + subject.
The verb "began" is the correct past tense form of "begin."
It is sed to describe an action that started in the past.
"Tastes" is a linking verb, so it is followed by an adjective ("bitter").
Adverbs modify actions, but taste describes a state, requiring an adjective.
The correct sentence is "Najma is in hospital; she has been ill for the last few weeks."
"Has been" is used here as it refers to an ongoing condition in the present perfect tense.
Did is the second form of do.
Therefore, the second form of sleep should be used.
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The train had gone before the passengers came.
This sentence uses the past perfect tense ("had gone") to show an action completed before another past action.
"Had" is the correct auxiliary verb for forming the past perfect.