Useful links for many grammatical points

Useful links for the grammatical points 

http://www.grammaring.com/first-conditional

http://www.grammaring.com/second-conditional

http://www.grammaring.com/modals-in-the-second-conditional

http://www.grammaring.com/if-even-if-only-if-as-long-as-provided-supposing-unless-but-for-if-necessary-if-so-in-case-etc

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http://www.grammaring.com/indirect-speech

http://www.grammaring.com/