How to fetch data while innerjoing as one of the table misses reference data

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SQL-Server

Hi All

I have 4 tables let it be a,b,c,d .I want to innerjoin those 4 tables to get result.Table a's Primary key will be the foregin key of b,c,d .I write a common query to innerjoin those 4 tables.but in my case there may or may not be corresponding data in b,c or d.At that time my query doesnt fetch values .Data returns only when there is a's primary key in the tables b,c and d.How to fetch data even if no datas in any of the table b,c,d.

Thanks in Advance
Amrutha.