Step-by-step explanation:
If Bobby does not understand German and Liam said "I love you" in German, he can simply ask Liam to repeat the phrase in English or another language that Bobby understands. Alternatively, Bobby can use an online translation tool or a language dictionary to translate the phrase himself.
It's important to communicate clearly and make sure both parties understand what is being said to avoid misunderstandings. In this case, it's also possible for Liam to explain what he said in German and its meaning to Bobby. This can be a good opportunity to learn a new language or to practice one's language skills.