Infinitives and Purpose in English

This video tutorial by Dan from BBC Learning English covers the use of infinitives of purpose in English. It explains how infinitives can be used to express the reason for an action, with examples like 'to get better at speaking English.' The video also discusses using 'for + somebody' to indicate actions done on behalf of others, and more formal expressions like 'in order to' and 'so as to.' It highlights how to form negatives with these expressions and the correct usage of infinitives with nouns, pronouns, and indefinite pronouns. The tutorial concludes with examples and clarifications on common mistakes.

What is the primary purpose of using an infinitive of purpose in English?

• To describe the manner of an action

• To show the location of an action

• To explain the reason for an action

• To indicate the time of an action

Which of the following sentences correctly uses an infinitive of purpose?

• She went to the store for buying milk.

• I am going to the gym for to exercise.

• He studies hard to pass the exam.

• They are here for to help us.

Which of the following is a correct use of an infinitive of purpose?

• I am going to the gym for to exercise.

• She went to the store for buying milk.

• He studies hard to pass the exam.

• They are here for to help us.

How do we express doing an action on behalf of someone else?

• Using 'to + infinitive'

• Using 'for + somebody'

• Using 'by + gerund'

• Using 'with + noun'

Which sentence correctly uses 'for + somebody'?

• He cooked dinner for to eat.

• They went to the park for to play.

• I bought a gift for to make her happy.

• She wrote a letter for him to read.

What is a more formal way to express purpose?

• Using 'in order to' or 'so as to'

• Using 'to + infinitive'

• Using 'by + noun'

• Using 'for + gerund'

How can you make 'in order to' negative?

• By adding 'not' after 'to'

• By using 'to not'

• By adding 'not' before 'to'

• By using 'in order not to'

Which of the following is a correct negative form using 'so as to'?

• He left early so as not to miss the bus.

• She stayed late so as to not finish the work.

• I studied hard so as to not fail.

• They arrived on time so as not to be late.

What is the correct way to express a negative purpose?

• Using 'not to + infinitive'

• Using 'for not + gerund'

• Using 'in order not to + infinitive'

• Using 'to not + infinitive'

What is incorrect about the sentence: 'I went to bed not to watch TV'?

• It uses 'not' incorrectly with 'to + infinitive'

• It should use 'so as to'

• It should use 'in order to'

• It should use 'for + gerund'