Donald Trump1 has announced2 he will run for president again in 20243, saying he would make sure Joe Biden did not get another four years in office4.
析：该句的主干为主谓宾结构，其中，主语为“Donald Trump”，谓语为“has announced”，其后跟随宾语从句“he will run for president again in 2024”；现在分词短语“saying he would make sure...in office”作状语，其逻辑主语为“Donald Trump”。
1. emergency meeting 紧急会议
例：Yesterday, the centre's board held an emergency meeting.
a state of emergency 紧急状态
例：The government has declared a state of emergency following the earthquake.
2. run for 竞选
例：He has already stated his intention to run for election.
run after sb. 追求某人
例：He's always running after younger women.
3. make sure 确保，保证，确定
例：Make sure you lock the door when you go out.
be sure of/about sb. 对某人有信心
例：Henry has only been working for us for a short while, and we're not really sure about him yet.
4. launch 发射
例：NASA plans to launch a satellite to study cosmic rays.
launch into sth. 发起，开始（评说、批评等）
例：He launched into a verbal attack on her handling of the finances.
5. return to... 返回......
例：She longed to return to her native land.
in return 作为交换；作为回报
例：Some tenants get rent reductions in return for help managing the building.