Will versus Going To
To be going to + infinitive and ‘will + infinitive’ have similar meanings when used for prediction.
The weather forecast says that it is going to rain tomorrow.
The weather forecast says that it will rain tomorrow.
The two tenses have separate meanings but overlap when we speak about prediction. Manchester United is going to win.
Manchester United will win.
When we use verbs such as, think, hope, or expect, it is more common to use ‘will + infinitive’.
I hope she’ll come.
We can also say: ‘I hope she’s going to come’.