Directions :Sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four.
Like humans, zoo animals must have a dentist to __ their teeth
The correct answer is option number 1st.
To +V1 is called as the infinitive form if the verb.
After `to' we use first form if the verb.
Infinitive form if the verb is used when we want to express the purpose,to answer why.
Ex-He studied hard to make his parents proud.
Why he do study -to make his parents proud.
Infinitive form is used as a subject of verb,as a object of verb,as the complement of the verb,as a object of preposition,to qualify noun,to qualify a sentence.
Here it is used as a `Adverb'.It qualifies verb `Studied'.
In the given example, options -`to be filled,filling,filled'are wrong.Because after `to' we can't use 3rd form of the verb,rest options are grammatically incorrect.
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