In the first examples, you have
Jacques a manqué son train.
Vite ! On va manquer le début du concert !
Why is manquer conjugated in the first example, but not the second. The sentence structure seems identical, except instead of have, it is go.?
I see that Jacques a manqué... is the passé composé, but I can't delete my question now.
In the first example that you quote, Jacques has already missed his train and so we have a completed past action.
In the second we have a near-future construction Aller plus infinitive in the sense that "one is going to miss" etc.
Hope this helps.
The different forms of manquer in the two sentences are due to grammatical context: the first one uses passé composé and manqué is the participle, whereas the second one is in future proche, with manquer being the infinitive. You have to look up how these two tenses are formed to understand the construction.
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