Some prayers can be said in any language, and many people use the English translation in siddurim to daven directly, the question is is one allowed to mix in both hebrew and English when first learning, for example to say "boruch ata adonoi eloheinu melech haolam, who has made us holy with his commandments and commanded us regarding the washing of the hands"?
and other similar brochos, to start out in hebrew [if one understands only the beginning] then continue or conclude in English, regarding the parts one doesn't understand?
Same goes for verses, for example "adonai has ruled for all eternity"? can one say the hebrew names of G-d in the middle of praying in english, or does one have to say "lord", "G-d", etc.?