Breakdown of Il faut payer cette facture aujourd'hui.
ce
this (before a noun)
payer
to pay
il
it (impersonal subject)
aujourd'hui
today
Questions & Answers about Il faut payer cette facture aujourd'hui.
The lesson is about changing -yer to -ier verbs. Why is payer spelled with a y here?
Why do we use cette instead of ce?
Does Il faut always mean 'It is necessary'?
Yes, it is a fixed expression. The il doesn't mean 'he' here; it acts like the 'it' in 'it is raining'. It translates roughly to 'it is necessary' or 'one must'. If you wanted to specifically say 'I must pay', you would use the verb devoir instead: je dois payer.