Not quite. Here's how you should write them. 1. 안녕하세요 토요일에 우리눈 (xxx's) 집에 가다. => 안녕하세요. 토요일에 우리는 xxx네 집에 갔습니다 [갔어요]. * -네 is a suffix indicating family or group the person belongs to. So "at Smith's home" would be 스미스네 집에서 or simply 스미스네에서. 2. 일요일에 나는 새로운 희망, 펜실베니아 가다. => 일요일에 나는 펜실베니아주 뉴홉에 갔습니다 [갔어요]. * New Hope, Pennsylvania is a name of a place, so no part of it should be translated. * In Korean, the order of designation of a place is the opposite of that in English. For example, Chicago, Illinois, USA would be 미국 일리노이주 시카고 (주 = state). * 가다 is the verb's base form. The base form is almost never used in conversation and ordinary writing. What we use are the conjugated forms which express the connotation and tense, politeness level(casual, polite), and speech style(informal, formal). There are four basic ending forms that are used very widely. For example, 가다 has these present and past tense forms. 1. 갑니다(present), 갔습니다(past): formal, polite. 2. 간다, 갔다: formal, casual. 3. 가요, 갔어요: informal, polite. 4. 가, 갔어: informal, casual. Since you're speaking to someone older in the past tense, you should use 갔습니다 or 갔어요.