India is the only country to _________ experimented with the electronic voting machine on a vast scale?
here correct ans is "have" but why "has" is wrong?
india is a singular verb so it should take "has"?
"To has" is wrong. The perfect infinitive is formed by "to"+ "have" + verb (past participle). org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
"To has" is wrong. The perfect infinitive is formed by "to"+ "have" + verb (past participle).
http://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked