Final answer:
The phrase 'Vamos a + [infinitive]' in Spanish functions as an informal way to suggest an activity, similar to 'let's' in English, but should not be confused with the subjunctive mood.
Step-by-step explanation:
Indeed, the phrase 'Vamos a + [infinitive]' in Spanish can be used to express the idea of 'let's (do something)'. When 'vamos' is used in the imperative form, it suggests a suggestion or proposal to do the activity mentioned by the infinitive verb that follows. It is an informal way of making a suggestion, similar to the English 'let's'.
However, it is important to distinguish this use from the subjunctive mood, which is used to express wishes, suggestions, or requirements in a more formal or hypothetical context.
The subjunctive uses different conjugations and is not equivalent to the imperative 'vamos a' structure.