Hello everyone! I have some questions about Chinese grammar could you please help me ? 1) 周日下午五点半他跟朋友一起去逛公园。 When we use 逛 ， should we always add something after it, or can we say 他跟朋友一起去公园逛？ When we use 散步 , how should we say that sentence ? And where should we put 一般 into the sentence above ? 2) 他一吃完饭， 就出来了。 can we use 了 in the first part of the sentence or can we omit 了 at all ? 3) 做作业的时候， 妈妈给我打电话。 is this sentence correct or should we add another 我 at the beginning? ( 我做作业的时候， 妈妈给我打电话 ） Thanks in advance !