TRIGGER: Help With 2 IFTHEN Statements Driving Multiple Inserts Into B_items Table...

Assuming I should be using values from temp inserted to insure correct record...
Need help coding IF...THEN INSERT statements in following After TRIGGER:

Create TRIGGER trg_insertItemRows

ON dbo.a_form
AFTER INSERT

AS
SET NOCOUNT ON
-- Checkbox Driven:
IF a_form.missingCheckbox = -1 THEN
Insert into b_items (form_ID, parent_ID, ItemTitle)
Values (Select Distinct i.form_ID,i.parent_ID from inserted i)', '+ 'User checked Missing Data')

-- Textbox Driven:
IF a_form.incorrectTxtbox <> 'na' THEN
Insert into b_items (form_ID, parent_ID, ItemTitle)
Values (Select Distinct i.form_ID,i.parent_ID from inserted i)', '+ Correction: Replace '+ incorrectTxtbox + ' with '+replaceWithTxtbox)


Sample code below:

-- Source table the Trigger acts on
Create Table a_form (
form_ID int Not Null,
parent_ID int,
missingCheckbox bit,
missingNote varchar(100),
incorrectTxtbox varchar(50),
replaceWithTxtbox varchar(50)
)

--Target table Trigger inserts into
Create Table b_items (
items_ID int Not Null,
form_ID int Not Null,
parent_ID int,
ItemTitle varchar(150)
)