1. Although we have only spent a few days together, our friendship will never end.2. She and I are in a romantic relationship.3. After she and I have spent time together, I began to feel an attachment to her.4. After the dog and I have spent time together, I began to feel attached to it.
 friendship relationship feel attached to something or somebody feel an attachment to somebody or something第一個例句意思是「雖然我們只有相處幾天，但感情卻是永遠的」friendship = 朋友間的友情relationship = 泛指任何的關係或感情romantic relationship = 愛情跟表示對某人或某物產生感情，非常貼切。
I tried to explain how the software works to my dad, but he is slw on the uptake.