Je le savais in French means "I knew it" in English.
I think that you used to know it is an English equivalent of 'Je pense que tu le savais'.
Je le savais.
"I prefer to..." in English is Je préfère... in French.
Je suis... in French is "I am..." in English.
"Je savais que tu l'aimerais." "Je savais que vous l'aimeriez." (formal)
"Can I ...?" in English is Puis-je ...? in French.
"(I) am" in English is (Je) suis in French.
"Je savais tout"
Je travaille! in French is "I'm working!" in English.
je savais que je t'aime avant que je vous
Je suis qui? in French means "Who am I?" in English.
Je me lève in French means "I am getting up" in English.