Just an addition to the above:
6. Я люблю, когда мы вместе
Is it okay that I use only nouns after ‘когда’?
After ‘когда’, everything can be used - nouns, verbs, adverbs, for example:
"Я не люблю, когда наполовину, или когда прервали разговор..." (I don't like things half-done, or when the conversation is being interrupted)