Look at these sentences, and think if you find any differences between them:
- I need to buy Marmite
1. What I need to buy is Marmite
2. It's Marmite that I need to buy
In sentences 1 and 2 a particular element (Marmite) is given a greater emphasis than in the basic sentence.
These two types of constructions (sentences 1 and 2) are called in English Cleft sentences and are used to bring particular elements of the clause into additional focus.
In the first example the focused element appears at the end of the sentence after the verb to be.
In the second one the focused element is after the subject It and the verb to be.