Be going to, Would, infinitive

Be going to i used to express future actions, planned in the past. (except the one that are for a schedule or program).
Example:
- I´m going to buy a new car next week.
- They ´re going to move house.
- She´s going to have a baby.
- We´re going to get married next summer.
- Linda´s going to learn Italian.


Would

"Would" is most commonly used to create conditional verb forms. It also serves as the past form of the modal verb "will." Additionally, "would" can indicate repetition in the past. For more information on the grammar behind the modal verb "would," 

Examples:

• If he were an actor, he would be in adventure movies. conditional
• I knew that she would be very successful in her career. past of "will"
• When they first met, they would always have picnics on the beach. repetition

Infinitive:

Certain words are followed by an infinite verb with or without ‘to’.

Use and Word Lists	Example
as the subject of a clause	To know you is to love you.
after certain expressions (without ‘to’)	Why not go to the cinema?
after certain verbs (without ‘to’)	I can swim.
after certain verbs (with ‘to’)	He wants to swim.
after certain verbs with interrogatives (infinitive constructions)	They don’t know how to swim.
after certain verbs with objects (without ‘to’)	He made her swim.
after certain verbs with objects (with ‘to’)	They wanted him to swim.
after certain adjectives and their comparisons	It’s easier to swim downstream.
after nouns deriving from the verbs mentioned above	We made a promise to swim. (derived from the verb ‘to promise’)