On: every psalm and song in the daily prayers uses today’s English. Off: all of them use the older “thee and thou”. Until you choose, the Songs of Zechariah, Mary and Simeon use today’s English, as most churches sing them. The Lord’s Prayer and the prayers for the dying show the form most people learned.
The naming of the Trinity at the start of worship: in the name of the Father, and of the Son, and of the Holy Spirit. A reminder of baptism, not a request for God to arrive.
In Worship — The liturgy, the daily office, and the furniture of a service.