Questions

The phrase ‘could not be able’ needs to be replaced with ‘was not able’ to make the sentence correct. As the action has already taken place so use of modal is incorrect. Thus, the correct sentence would be, ‘She told her teacher that she was not able to attend the class the previous day because of heavy rains’.

‘Prefer’ is followed by the gerund form of the verb. Thus, ‘spend’ needs to be replaced with ‘spending’ to make the sentence grammatically correct. Thus, the correct sentence would be, ‘Though he is a gifted comedian, he prefers spending his spare time watching horror movies.

Hydrogen Bomb is based on the principle of Nuclear Fusion.

• Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.

• The difference in mass between the reactants and products is manifested as either the release or absorption of energy.