You should go for _____ early morning walk.

Concept

The choice between the indefinite articles “a” and “an” is decided by the SOUND that begins the very next word, not by its spelling. Use “a” before a consonant sound and “an” before a vowel sound.

Application

• The word right after the blank is “early”, pronounced /ˈɜːr.li/. It begins with the vowel sound /ɜː/.

• A word beginning with a vowel sound takes “an”, so the phrase is “an early morning walk”.

• The advice is general (walking in the morning as a habit), so an indefinite article — not the definite “the” — is needed; “walk” here is a singular countable noun.

Cross-check / Contrast

• “a” fails because it pairs with a consonant sound, but “early” opens with a vowel sound — “a early” is not idiomatic.

• “the” would mark one specific, already-identified walk; the sentence is giving general advice, so it does not fit.

• Compare with the spelling-vs-sound trap: “a university” (the “u” sounds like /juː/, a consonant sound) versus “an hour” (silent ‘h’, vowel sound). “early” clearly starts with a vowel sound, confirming “an”.

Correct sentence: You should go for an early morning walk.