We use ごご for both ways. As an additional point, when we use the pm in the sentence, the time is just after ごご. In other word, when you find ごご without any following words related to the time, this means afternoon. And, yes! You can say that. I will put an example here. ごぜんははれてましたが、ごごはあめですね。 Thanks,

I will put the simple example to get some ideas between these two words. 上司は家に帰りました。He left the office. i will be not able to reach him out today, therefore recall him tomorrow. I will put the simple example to get some ideas between these two words. 上司は家に帰りました。He left the office. I will call him tomorrow, then. 上司は家に戻りました。He was back home, then will return to the office. I will ask the possible time to call him again within the same day. Hope this helps you.

Below is my translation to Japanese. Hope this helps you. 北野さんとの会話中に、彼がどのような人なのか気になっています。 Your sentence is understandable what you want to say. However, to polish your Japanese try to use some of connecting words between comma. This is just my suggestion to you.

I think the answer above is perfect! Also we can say shorter, スカイプを使っていますか。 　　　　　　　　 スカイプを持っていますか。 In the same way, you can apply to Facebook or Twitter.

Your first sentence is the past passive form, therefore you can apply this form to verb as same as the simple passive. The only point is the verb's last syllable will change in the passive structure, like English! Below is the examples. (Simple Verb) push 押す (Simple Passive) is pushed 押さ れる (Past Passive) was pushed 押さ れた Then, you might be confused to some of adj and verb. (Simple Adj) be creepy 怖い (Past Adj) was creepy 怖かった Hope this helps you!