The error is in the second part of the sentence.

Verbs like ‘ask’, ‘advise’, ‘allow’, ‘command’, ‘invite’, ‘forbid’, ‘encourage’ etc. are followed by to + infinitive form of the verb.

Therefore, ‘leaving’ must be replaced with ‘leave’ to form a grammatically correct sentence.

Hence, option B is the correct answer.

The error is in the second part of the sentence.

We use bare infinitive and not ‘to-infinitive’ after words like ‘let’, ‘behold’, ‘watch’, ‘see’, ‘feel’, ‘make’ etc.

Therefore, remove ‘to’ from the phrase ‘to make’ to form a grammatically correct sentence.

Hence, option B is the correct answer.

The error is in the third part of the sentence.

We use bare infinitives after modal auxiliaries like ‘can’, ‘could’, ‘may’, ‘might’, ‘shall’, ‘should’, ‘will’, ‘would’, ‘must’ etc.

Therefore, ‘to’ must be removed after ‘must’ to form a grammatically correct sentence.

Hence, option C is the correct answer.

The error is in the first part of the sentence.

We use ‘had better’ to refer to the present or the future, to talk about actions we think people should do or which are desirable in a specific situation.

The verb form is always ‘had’ and not ‘have’. It is followed by the infinitive without to.

‘Had better’, ‘had rather’, ‘had sooner’, ‘would rather’ etc. are followed by bare infinitive rather than to-infinitive.

Therefore, ‘to’ must be removed from the first part to form a grammatically correct sentence.

Hence, option A is the correct answer.

The error is in the third part of the sentence.

It is because conjunction ‘than’ is followed by a bare infinitive rather than to-infinitive.

Therefore, ‘to have’ should be replaced with ‘having’ to form a grammatically correct sentence.

Hence, option C is the correct answer.

The error is in the second part of the sentence.

The verbs like ‘ask’, ‘advise’, ‘allow’, ‘made’, ‘command’, ‘invite’, ‘forbid’, ‘encourage’ etc. are followed by Object + to + first form of the verb.

Therefore, ‘using’ must be replaced with ‘use’ to form a grammatically correct sentence.

Hence, option B is the correct answer.

The verb ‘tell’ is followed by an indirect object without ‘to’. Therefore, it should be ‘told me’ rather than ‘told to me’ to form a grammatically correct sentence.

Hence, option D is the correct answer.

The error is in the first part of the sentence.

We use present participle after ‘to be + busy’. Hence, ‘to try’ must be replaced by ‘trying’ to form a grammatically correct sentence.

Therefore, option A is the correct answer.

The error is in the first part of the sentence.

The phrase ‘having seeing’ is incorrect. Also, when two tasks are done simultaneously by the same subject or one task is immediately after the second task, the present participle is used for the first work.

It should, therefore, be re-written as ‘Seeing the tide was now running in his direction, he renewed his campaign for reform’.

Hence, option A is the correct answer.

The error is in the first part of the sentence.

Some participles such as considering, judging, referring, concerning, regarding, viewing, broadly speaking etc. do not have any reference of subject.

It should, therefore, be re-written as ‘Considering the strength of the opposition, we did very well to score two goals’.

Hence, option A is the correct answer