feel nervous → 緊張してる feel good → 気持ちいい feel sick → 気分が悪い Sounds good! → いいね！(show an agreement) sounds awful → ひどい！ seems happy → 喜んでるらしい seems unconvinced → 納得してないらしい seems amused → 面白がってるらしい looks terrible → ひどく見える looks happy → 喜んでるように見える looks angry → 怒ってるように見える looks bored → 退屈そうに見える looks embarrassed → 恥ずかしそう tastes bad → まずい tastes bitter → にがい tastes sweet → 甘い He looks great. 彼はとても元気そうだ。 That looks great on you. とてもお似合いです。

To describe a verb with an adjective, you can turn the adjective into an adverb! For an い-adjective you'll turn い into く, and for a な-adjective you'll add に. For example: 速い (fast) 走る (to run) 速く走る (to run fast) 簡単 (simple) 説明する (to explain) 簡単に説明する (to explain simply) Keep in mind that not all English expressions will have a direct translation. For your example, "It tastes good", I can't think of an appropriate intransitive verb of "to taste" in Japanese (doesn't mean there isn't one, just that I can't think of one right now). Instead, a Japanese speaker might simply say 「おいしいです。」 (It's delicious/tastes good)

You can just simplify this to mean "It's good (the taste)" in which case おいしい! is what I hear most often. I don't think there is a specific rule to follow when it comes to this kind of structure since there are so many ways to express this in Japanese depending on what it is you're talking about. You might want to study up ~そう (the food) looks good = おいしそう (that tv drama) sounds interesting = おもしろそう

Let me give you another example. / e.g. The red tie looks good on you. / In this case, "looks good" literally means "良く見える", though most people just say "似合う" to express that kind of feeling.

It depends on what verb you put there. As for your example, it literally means "良い味がする", which many people usually just say "おいしい".