Learn Turkish: Çocuklar okula bisikletle gidiyor. - The children are going to school by bicycle.

The suffix -le is the attached form of the word ile, which means 'with' or 'by means of'. When talking about transportation, it translates perfectly to 'by'. Because bisiklet ends in a consonant and its last vowel is an 'e', it follows vowel harmony and takes the front-vowel form -le.

Why is the verb gidiyor instead of gitiyor?

The root of the verb 'to go' is git-. When you add a suffix that starts with a vowel, like the present continuous tense suffix -iyor, the hard t softens into a d. This is a common rule called consonant mutation, and it happens with a few everyday verbs like gitmek (to go) and etmek (to do).

Why do we add -a to the end of okul?

The -a is the 'to' suffix (officially called the dative case). Okul means 'school', so okula means 'to school'. In Turkish, you must attach this suffix to the destination whenever you use a verb of direction or motion, like gitmek.

Could I put bisikletle earlier in the sentence, like Çocuklar bisikletle okula gidiyor?