'Pray' in the Bible

Decide for yourselves: Is it proper for a woman to pray to God with her head uncovered?

Therefore, the person who speaks in a foreign language should pray for the ability to interpret it.

For if I pray in a foreign language, my spirit prays but my mind is not productive.

What does this mean? I will pray with my spirit, but I will also pray with my mind. I will sing psalms with my spirit, but I will also sing psalms with my mind.