The true structure of the Welsh grammar will be revealed only when we look at sentences slightly more complicated than its basic VSO pattern. Welsh is no different from the rest of the world: it does involve an extra step, but even that isn't all that unusual. Welsh is like Shakespearean English on acid: the verb always - not just in questions - moves to the beginning. Alternatively, it can be viewed as taking the French grammar a step further. While the verb stops at tense in French, it moves further in Welsh to a position that traditional grammarians call the complementizer (don't ask).
Charles Yang, The Infinite Gift: How Children Learn and Unlearn the Languages of the World
french, grammar, language, welsh