431. Shade or Shadow
(a) Shade
(X) I like to sit in the shadow.
(O) I like to sit in the shade.
(b) Shadow
(X) The dog saw his shade in the water.
(O) The dog saw his shadow in the water.
"Shade" is a place sheltered from the sun.
"Shadow" is a shade of a distinct form as of a tree, a man, a dog, etc.
432. Customer and Client
(a) Customer
(X) That grocer has plenty of clients.
(O) That grocer has plenty of customers.
(b) Client
(X) That lawyer has plenty of customers.
(O) That lawyer has plenty of clients.
A person can be a customer at a shop, but a client of a lawyer, a hank, etc
433. Stranger for Guest
(X) They had some strangers last night.
(O) They had some guests last night.
A "guest" is usually a friend who comes to our house tor a visit, while a "stranger" is a person unknown to us.
Note: A foreigner is a person from another country and speaking a foreign language.