Wo zheng zai kan ni (for: I am looking at you) ------wo zai kan ni. Xianzai wo zheng zai shuo zhongwen. (Now I am speeking in chinese) ------wo zai shuo zhong wen. Ni zheng zai chi mifan (You are eating rice) ni zai chi mi fan.

wo zai kan ni我在看你（I'm looking at you) ni zai chi fan你在吃饭(You are eating rice) all senteces you type is correct but it's not normal in oral chinese

Xianzai wo zheng zai shuo zhongwen.现在我正在说中文 (*Now I am speaking chinese)

yes,all the sentences u type is correct .

我在看（着）你。/现在我在说汉语（普通话）。/我在吃饭。Don't write pinyin use characters please. Pinyin is hard to read and to understand.