Dependent prepositions: learn the word with its preposition

In English the preposition is often chosen by the word before it, not by the meaning of the sentence: you rely on something, contribute to it, account for it. These combinations are fixed and frequently differ from the Russian or Armenian case or postposition, so each one has to be learnt as a single unit.

• Demand for housing depends on interest rates.
• Poor diet can lead to serious health problems.
• Her theory accounts for most of the observed data.

Verb patterns: to-infinitive, -ing or that-clause?

When a second verb follows, the first verb decides its form. There is no general logic to rely on: agree takes a to-infinitive, recommend takes -ing, enable needs an object before the to-infinitive. Each verb has to be stored together with its pattern.