1 Travel for Journey.
Don"t say: Our travel to Wales was lovely.
Say: Our journey to Wales was lovely.
Travel is a verb while journey is a noun.
2 Customer and Client.
(a) Customer.
Don"t say: That grocer has plenty of clients.
Say: That grocer has plenty of customers.
(b) Client.
Don"t say: That lawyer has plenty of customers.
Say: That lawyer has plenty of clients.
A person can be a customer at a shop, but a client of a lawyer, a bank, etc.
3 Sick or Ill.
Don"t say: He"s been sick for over a year.
Say: He"s been ill for over a year.
To be ill means to be in bad health. To be sick means to vomit().
4 So and Such.
(a) So.
Don"t say: It"s such small that you can"t see it.
Say: It"s so small that you can"t see it.
(b) Such.
Don"t say: I"ve never seen a so large animal before.
Say: I"ve never seen such a large animal before.
So is an adverb, and must qualify an adjective or another adverb. Such is an adjective, and must qualify a noun.
5 Accept for Agree.
Don"t say: the teacher accepted to go with us.
Say: The teacher agreed to go with us.
Accept means to take something that is offered to you or to believe something you"re told. Agree to means to do what one is asked to do, but agree with means to have the same opinion as someone else.