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The calf which is limping is hungry.
All the three calves are being fed on by the lion.
The black calf is fighting with a buffalo.
Baby elephant is called a calf.That is why i have used the word calf in all the sentences.
In the first sentence, the word 'limping' is representing present tense verb.
In the second sentence,the words 'are being fed on' represents present tense verb.
In the third sentence,the word 'fighting' represents present tense verb .