Question

Fill in the blank with the most appropriate word:
Tom will mend the window when _____________ home.
a) He come
b) Does he come
c) He is coming
d) He comes

Answer 1

Hint: It is a question of selecting the appropriate tense of the word. Note that the sentence is in the future tense. Tom will come home and then he will mend the window. Select your answer accordingly.

Complete answer:
 Option a is wrong because “come” cannot be used with a singular noun. A plural verb is used with a singular noun- She goes, he stays, the dog walks, etc. A singular verb is used with a plural noun- They walk, the friends play together, etc. This option is wrong.
Option b is wrong because it is sounding like a question. The use of does in the sentence is wrong and unrequired.
Option c is wrong because we cannot see Tom coming to the house at that very moment. “Coming” signifies a continuous tense, that is, that thing is happening at that very moment. The sentence however means that when Tom will come home (we don’t know when), then he will fix the window.
Option d is the correct answer because the tense is correct. Also, the plural form of verb (comes) has been used with a singular noun (Tom). Thus, the correct sentence is Tom will mend the window when he comes home.

Note:
To be completely sure of the answer, use the chosen option in the given sentence to see if it is grammatically correct. In the given question, none of the options in itself is wrong. But when it is placed in the sentence, it does not make sense.