Final answer:
The verbs cry and buy require changing y to i before adding the suffix -ed, while play and enjoy do not. The correct options are A and B.
Step-by-step explanation:
You are asking which of the verbs cry, buy, play, and enjoy require changing the y to i before adding the suffix -ed.
To answer this, we should apply a common spelling rule in English: when a verb ends in a consonant plus y, you must change the y to i before adding the suffixes -ed (for the past tense) and -es (for the third person singular present tense).
However, if the verb ends in a vowel plus y (like in the case of 'play' and 'enjoy'), there is no need to change the y to i.
Following this rule, the verb 'cry' (cried) and 'buy' (bought) would require the change from y to i when adding the suffix -ed, while 'play' (played) and 'enjoy' (enjoyed) would not.The correct options are A and B.