✅ Both taking pains and taking the trouble imply a watchfulness to do things right (take the trouble to write a letter; take pains to learn long division).
✅ To take pains suggests careful effort to pay attention to every small detail (They took pains to avoid saying the wrong thing).
✅ Use take the trouble when more activity and exertion are involved and sometimes more inconvenience (By holding one-on-one meetings, she actually took the trouble to get to know her employees).
✅ Endure is best when someone or something continues persistently even in the face of difficulties (endure pain; endure hardships).
✅ Both endure and continue can be used when something exists without interruptions for a length of time.
✅ Endure reinforces the idea that there is an influence working against someone or something's existence, even if it is only time.
✅ Aid and assist are both more formal and less personal words than help and imply the furthering of another’s efforts (Please assist him with the paperwork; The tea aids in digestion).
✅ Assist is better than aid when there is less need for help (assist clients; assist in planning).
✅ Aid works best when an entity like a government is helping someone or providing support for an endeavor (aid the development of programs; aid the poor).