Is Gaia important in Greek mythology is an English equivalent of 'Est-ce que Gaia est importante dans la mythologie grecque'.

The verb 'est' means '[he/she/it] is'. The demonstrative 'ce' means 'this'. The relative 'que' means 'that'. The feminine name 'Gaia' is the Mother Goddess in Greek mythology. The feminine adjective 'importante' means 'important'. The preposition 'dans' means 'in'. The feminine definite article 'la' means 'the'. The feminine noun 'mythologie' means 'mythology'. The feminine adjective 'grecque' means 'Greek'.

All together, they're pronounced 'eh-skuh geh-ah eh-tehm-pohr-tawnt daw lah mee-toh-loh-zhee grehk'.

And yes, Gaia is important. She got life started as the world's first mother. So she's the maternal ancestor of the important ancient Greek gods, such as Zeus, the king of the gods.