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Used with adjectives:
"
This building has a firm base."
(firm, solid, strong, concrete, steel, iron)
"
His ideas have a solid base."
(solid, firm, strong, sound, scientific, religious, historical)
"
The politician has a strong Democratic base."
(Democratic, Republican, conservative, liberal)
"
We must protect the military base."
(military, air force, missile, army, naval)
Used with verbs:
"
We created a concrete base for the tower."
(created, built)
"
He established a solid customer base."
(established, has)
"
Our company is trying to grow its customer base."
(grow, expand, broaden, develop, improve, increase)
"
The enemy soldiers are attacking the base."
(be + attacking, be + destroying, be + defending)