He wants to know when to use the gerund (doing) and when to use the infinitive (to do). 1. After a preposition, we use the gerund. The prepositions can come after an adjective, after a verb or at ...

As emphasized in the preceding chapter, the basic rule for parallel construction is to never mix grammatical forms when ...

PARALLEL construction is one of the most powerful tools for organizing and presenting ideas in writing. Indeed, it cannot be overemphasized that making sentences grammatically and semantically correct ...