Both sentences are grammatically correct, but Sentence 1 ("Young people may be easily influenced by cigarette advertisements.") is more natural and commonly used in English.
Explanation:
- Adverb placement: In English, adverbs like "easily" typically go after "be" in passive voice constructions (e.g., "may be easily influenced").
- Sentence 2 ("may easily be influenced") is not incorrect, but it sounds slightly more formal or poetic.
In everyday usage, Sentence 1 is the preferred choice.
A good rule of thumb for adverb placement in passive voice:
✔ Auxiliary verb (may, can, must, etc.) → "be" → adverb → past participle
Example: Young people may be easily influenced by cigarette advertisements.
If the adverb is short and modifies the entire verb phrase, it can go between the auxiliary verb and "be" (e.g., may easily be influenced), but this is less common in everyday English.
For natural-sounding sentences, place the adverb after "be" in the passive voice.