Sometimes I go by myself, and sometimes I go with a friend.
I go by myself once in a while, but I also go with my friends.
ーSometimes I go by myself, and sometimes I go with a friend.
「時々一人で行くし、時々友達と行く」
to go by oneself で「一人で行く」
to go with a friend で「友達と行く」
ーI go by myself once in a while, but I also go with my friends.
「たまに一人で行くけど、友達とも行く」
once in a while で「たまに」
ご参考まで!