onduler

Regular -ER verbs: 'onduler' is a regular -ER verb. To conjugate regular -ER verbs in the present tense, drop the -ER and add the following endings: -e, -es, -e, -ons, -ez, -ent.

J'ondul-e (I undulate), Tu ondul-es (You undulate), Il/Elle/On ondul-e (He/She/One undulates), Nous ondul-ons (We undulate), Vous ondul-ez (You undulate), Ils/Elles ondul-ent (They undulate).

Passé Composé with Avoir: To form the passé composé (past tense) of 'onduler', use 'avoir' as the auxiliary verb and the past participle 'ondulé'.

J'ai ondulé (I undulated), Elle a ondulé (She undulated).

Imparfait: To describe ongoing or habitual actions in the past, use the imparfait. For 'onduler', remove the -ons from the 'nous' present tense form (ondulons) to get the stem 'ondul-' and add the imparfait endings: -ais, -ais, -ait, -ions, -iez, -aient.

Les vagues ondulaient (The waves were undulating), Il ondulait (He was undulating).

Subjunctive Mood: When expressing doubt, desire, or emotion, the subjunctive mood might be used. For 'onduler', the subjunctive forms follow the regular -ER pattern.

Il faut que j'ondule (It is necessary that I undulate), Je doute qu'il ondule (I doubt that he undulates).

Using 'onduler' with nouns: 'onduler' can describe the movement of various things. Pay attention to agreement when using adjectives derived from 'onduler' or describing things that 'ondulate'.

Les mouvements ondulants (The undulating movements - 'ondulants' agrees with 'mouvements').