我需要帮助修复这个 VBA 宏

Question

I am new In VBA. I dont know how to use it but I am trying. I am trying to create a code that say:

if tmin < t < tmax then put "Valid" in the cell of the comment column but if not then put "Invalid" only

if it is valid then check if the argument < 0.001 if it is then put "Valid & LN" in cell

if the argument > 0.001 just put "Valid" only

if the argument > 10 put "Valid & 0"

Here is my try out that doesn't work

Option Explicit
Function VC(t As Double, argument As Double, tmax As Double, tmin As Double) As Double
Dim i As String
If tmin < t < tmax And argument < 0.001 Then
    i = "Valid & LN"
ElseIf argument > 10 Then
    i = "Valid & 0"
Else
    i = "invalid"
End If
End Function

Here is how it has to look like and the columns I am using:

Tmax & Tmin cells

Time, Argument and how the Comment cells have to look like

Answer 1

My guess is

Option Explicit

Function VC(t As Double, argument As Double, tmax As Double, tmin As Double) As String

    Dim i As String

    If tmin < t And t < tmax Then

        i = "Valid"

        If argument < 0.001 Then
            i = "Valid & LN"
        ElseIf argument > 10 Then
            i = "Valid & 0"
        End If

    Else
        i = "invalid"

    End If

    VC = i

End Function