When two or more phrases are put together using a conjunction (e.g., “and”, “or”), they should belong to the same category (i.e. noun phrase, verb phrase, adjectival phrase, etc.) (see also Word Class).
In example 1, the verb phrase “will be distributed” is in the passive form of the simple future tense, which is wrongly linked with a verb in its root form (i.e. “post”). To correct the sentence, use the past participle form of “post” instead (i.e. “posted”).
 
In example 2, the gerund phrase “planting” and two other noun phrases (i.e. “gardens”, “water features”) are wrongly linked together. Three nouns/ noun phrases should be used instead,  for instance “plants”, “gardens” and “water features”. 
 

 

WRONG
RIGHT

1.

Leaflets will be distributed in shopping malls as well as the MTR, and post to people’s mailboxes.

Leaflets will be distributed in shopping malls as well as the MTR, and posted to people’s mailboxes.

2.

Elements like planting species, gardens and water features can be designed freely.

Elements like plants, gardens and water features can be designed freely.

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