Learn French: J'aurai creusé un trou très profond. - I will have dug a very deep hole.

The futur antérieur (future perfect) is formed like the passé composé, but the auxiliary verb is in the future tense instead of the present. Here, we take the future tense of avoir for je (j'aurai) and add the past participle of the main verb creuser (creusé). It translates directly to "will have dug".

How can I remember not to write j'aurais creusé with an "s"?

Adding an "s" makes it j'aurais, which is the conditional tense. J'aurais creusé means "I would have dug" (the past conditional). Because this sentence means "I will have dug", you must use the future tense auxiliary j'aurai (without the "s").

Why is the adjective phrase très profond placed after un trou?

Most adjectives in French are placed immediately after the noun they describe. The exceptions are usually short, common adjectives relating to Beauty, Age, Goodness, or Size (the BANGS rule). While "deep" might feel like a size measurement, profond is treated as a regular descriptive adjective, so it goes after the noun.

Is the verb creuser regular?