SQL Conditional Statement in Where Clause - sql-server-2008

Question

I would like to write the following IF statement in SQL. Most of the where clause is constructed, but it's the condition around the statement that I'm struggling with:
if #StuYear = 11 then
AND (#TeachingGroup = 'Select All')
AND ([DataCollection] = #DataCollection)
AND ([Name] = #SubjectName)
AND (#Subgroup='Select All')
AND '' = CASE #subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND Result Not Like '[ABU]%' AND Result <> ''
else if #StuYear = 10 then
AND #TeachingGroup Not Like 'Select All'
AND ([DataCollection] = #DataCollection)
AND ([Name] = #SubjectName)
AND ([TeachingGroup] = #TeachingGroup)
AND #Subgroup='Select All'
AND '' = CASE #subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND Result Not Like '[ABC]%' AND Result <> ''
end if

Answer 1

Simply replace if with where and else if with or and surround the other conditions in paranthesis:
...
where (#StuYear = 11
AND (#TeachingGroup = 'Select All')
AND ([DataCollection] = #DataCollection)
AND ([Name] = #SubjectName)
AND (#Subgroup='Select All')
AND '' = CASE #subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND Result Not Like 'A*'
AND Result Not Like 'A'
AND Result Not Like 'B'
AND Result Not Like 'U'
AND Result Not Like '' )
OR (#StuYear = 10
AND #TeachingGroup Not Like 'Select All'
AND ([DataCollection] = #DataCollection)
AND ([Name] = #SubjectName)
AND ([TeachingGroup] = #TeachingGroup)
AND #Subgroup='Select All'
AND '' = CASE #subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND Result Not Like 'A*'
AND Result Not Like 'A'
AND Result Not Like 'B'
AND Result Not Like 'C'
AND Result Not Like '')

Answer 2

Tim's answer helped point me in the right direction. However, I eventually resolved the issue by applying the year condition within the where clause as opposed to rapping it around them:
where
(#StuYear = [stuyear]
AND #TeachingGroup = 'Select All'
AND [DataCollection] = #DataCollection
AND [Name] = #SubjectName
AND #Subgroup='Select All'
AND '' = CASE #subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND ((Result Not Like '[ABU]%' and result not like '' and stuyear='11')
or(Result Not Like '[ABC]%' and result not like '' and stuyear='10')
or(Result Not Like '[ABCD]%' and stuyear='9'))
AND Result <> '')
OR
(#StuYear = [stuyear]
AND #TeachingGroup Not Like 'Select All'
AND [DataCollection] = #DataCollection
AND [Name] = #SubjectName
AND [TeachingGroup] = #TeachingGroup
AND #Subgroup='Select All'
AND '' = CASE #subjectName WHEN 'English' THEN KS2en WHEN 'Mathematics' THEN KS2ma ELSE KS2av END
AND ((Result Not Like '[ABU]%' and result not like '' and stuyear='11')
or(Result Not Like '[ABC]%' and result not like '' and stuyear='10')
or(Result Not Like '[ABCD]%' and stuyear='9'))
AND Result <> '')