' Possibly. It is often said that smiles have a good effect on on human relationships. Yes, if you delete one 'on'.
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teacherJapanIt seems to me that 'have a -- effect on' is more often used than 'have ---effects on.'Possibly.
teacherJapanSo in the following example, is it more matural to use the singular form as opposed to the plural form?It is often said that smiles have a good effect on on human relationships.Yes, if you delete one 'on