Only if I try I can succeed.
Only if I try can I succeed.
ここの文では、 ‘can,’ が’I’の後にきてしまっていることが問題です。
‘Only if…,’ ‘only by…,’ ‘only then…,’ ‘only after…,’ ‘only before…,’ ‘only with…,’ etc., といった表現を用いる時には、「助動詞は主語の前にくる」、という法則があります。つまり、疑問形を作る時と同じ要領です。 (e.g. ‘Can I have two, please?’ not ‘I can have two, please?’).
何が違うでしょう?
Only after you have switched off your electric fan start cleaning it.
According to the Bible, only if a person has faith in Jesus Christ be declared righteous by God.
Only with our support get through this difficult time.