verb
1
BAD : They don't have any money to spend for luxuries.
GOOD : They don't have any money to spend on luxuries.
BAD : He spends everything he earns for his children.
GOOD : He spends everything he earns on his children.
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spend your time/money/$12/£5 etc + on sb/sth (NOT for ): 'I spend about half my salary on food.' 'You should spend more time on your homework.'
2
BAD : Parents should spend more time to look after their children.
GOOD : Parents should spend more time looking after their children.
BAD : I never spend more than an hour a day for studying.
GOOD : I never spend more than an hour a day studying.
BAD : She spends most of her free time on reading.
GOOD : She spends most of her free time reading.
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spend your time/five minutes/two days etc + doing sth : 'She spends all her time working on her thesis.'
3
See TIME 10 (↑ time ), 9