Change the following into present continuous tense:
The boys ______ play in the garden.
 

• To solve the given question, we want to vary the given sentence into present imperfect. The current imperfect tense is employed to explain an ongoing action at the instant the speaker is speaking. The syntax for this tense is as follows: an/is/are + participial.
• Now, glance at the given options one by one and find the foremost suitable option.
  Option ‘A’, the boys is playing in the garden, is wrong thanks to its grammatical inaccuracy.
  Option ‘B’, is wrong as we want an action that's happening right away, but this means an occurrence within the past.
  Option ‘D’, the boys have been playing in the garden, is wrong because it follows the format for perfect tense imperfect tense rather than the given syntax.
• Therefore, we will see that option ‘C’, ‘the boys are playing within the garden’, is that the correct answer because it follows the given syntax perfectly and there's no grammatical error.

Hence, option C is the correct answer.