1. 首先，需要使用VBA中的拼写检查功能，确定错误的单词是否存在拼写错误。可以使用以下代码来检查单元格中的拼写错误：

Function CorrectSpelling(ByVal str As String) As String
    On Error GoTo SpellCheckError
    Application.ScreenUpdating = False
    If Application.CheckSpelling(str) Then
        CorrectSpelling = str
        Exit Function
    End If
SpellCheckError:
    Dim Suggestions As Variant
    Suggestions = Application.GetSpellingSuggestions(str)
    If Not IsEmpty(Suggestions) Then
        CorrectSpelling = Suggestions(1)
    Else
        CorrectSpelling = str
    End If
    Application.ScreenUpdating = True
End Function

2. 接下来，需要遍历文档中的所有单词，检查每个单词及其前后位置的单词是否存在拼写错误。可以使用以下代码来遍历文档中的单词：

Sub CheckSpellingBeforeAndAfter()
    Dim wdApp As Word.Application
    Dim wdDoc As Word.Document
    Dim wdRange As Word.Range
    Dim wdWords As Word.Words
    Dim wdWord As Word.Range
    Dim wdPrevWord As Word.Range
    Dim wdNextWord As Word.Range
    
    Set wdApp = CreateObject("Word.Application")
    wdApp.Visible = True
    Set wdDoc = wdApp.ActiveDocument
    Set wdRange = wdDoc.Content
    
    Set wdWords = wdRange.Words
    For Each wdWord In wdWords
        If Not wdWord.SpellingErrors.Count = 0 Then
            Set wdPrevWord = wdWord.End - 1
            Set wdNextWord = wdWord.End + 1
            If Not wdPrevWord.Characters.First = wdRange.Characters.First Then
                If Not wdPrevWord.SpellingErrors.Count = 0 And Not wdPrevWord.InRange(wdWord) Then
                    MsgBox "Misspelled word found: " & wdPrevWord.Text & " " & wdWord.Text & " " & wdNextWord.Text & " Suggested correction: " & CorrectSpelling(wdPrevWord.Text & " " & wdWord.Text)
                End If
            End If
            If Not wdNextWord.Characters.Last = wdRange.Characters.Last Then
                If Not wdNextWord.SpellingErrors.Count = 0 And Not wdNextWord.InRange(wdWord) Then
                    MsgBox "Misspelled word found