配搭 “at the moment” 和介词 “actually” 都能够用在句首。“At the moment” 用于叙述事儿产生的时间 “此刻”；而 “actually” 的意思是 “事实上，实际上”。
1 “At the moment” 的意思是 “此刻，现阶段”。
I'm studying at the moment because I have an exam tomorrow.
I'm sorry. He's not here at the moment. Would you like to leave a message?
At the moment, They're renovating their new home so they don't have any spare time.
2 介词 “actually” 的意思是 “事实上，实际上”。它一般用于明确提出与大家所坚信的事儿反过来的信息内容。
I thought I had got the answer correct, but actually it was wrong.
Many people think it always rains in the UK. Actually, it only rains most of the time.
The police are unclear as to what actually happened.