by oneself;oneself
by oneself=alone,without help。强调“在无他人或他物的情况下”或“无帮助的情况下”;
oneself作同位语,表示强调本人。
试比较:
If you come to my house,I’ll cook for you myself.
如果你来我家,我将亲自下厨。(强调亲手为你做饭)
Can you cook by yourself now? 你现在能单独做饭了吗?(强调无他人协作)