(Bridge) the salary gap between specialists and primary cae physicians.动词可以放在句首吗?

(Bridge) the salary gap between specialists and primary cae physicians.动词可以放在句首吗?
(Bridge) the salary gap between specialists and primary cae physicians.
1.问bridge 在这里是动词,调整,消除的意思.可动词可以直接放在句首吗?我记得除了祈使句,放在句首的要名词或者动名词吧?
同样,另一个例句也是动词在句首:
(Reduce) the tuition of sudents who choose primary care as their major.
2.除了名词,动名词,副词可以放在句首,还有别的词性可以放在一个句子的句首开始的位置吗?我看有些是TO开头的.
比如:To bridge the gap between two people or things means to reduce it or get rid of it.
备注:是primary (care) physicians,少打一个r.