How To Add Class To Table InstructorCourses

I need to make schedule for Instructor include
day,time,date time,courses,classes(lab or class room),instructor
so that i designed my database as following
my relations as following
Instructor with courses many to many
class with instructor many to many
Relation between class and instructor many to many because instructor can teach in more classroom and class room can have more instructor

01CREATE TABLE [dbo].[Courses](
02    [CourseID] [int] IDENTITY(1,1) NOT NULL,
03    [CourseName] [nvarchar](50) NOT NULL,
04 CONSTRAINT [PK_dbo.Courses] PRIMARY KEYCLUSTERED
05(
06    [CourseID] ASC
07)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
08) ON [PRIMARY]
09 
10CREATE TABLE [dbo].[Class](
11    [ClassID] [int] IDENTITY(1,1) NOT NULL,
12    [ClassName] [nvarchar](50) NOT NULL,
13 CONSTRAINT [PK_dbo.Class] PRIMARY KEY CLUSTERED
14(
15    [ClassID] ASC
16)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
17) ON [PRIMARY]
18 
19CREATE TABLE [dbo].[Instructor](
20    [InstructorID] [int] IDENTITY(1,1) NOT NULL,
21    [IstructorName] [nvarchar](50) NOT NULL,
22 CONSTRAINT [PK_dbo.Instructor] PRIMARY KEYCLUSTERED
23(
24    [InstructorID] ASC
25)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
26) ON [PRIMARY]
27 
28CREATE TABLE [dbo].[InstructorCourses](
29    [CourseID] [int] NOT NULL,
30    [InstructorID] [int] NOT NULL,
31    [fromtime] [nvarchar](50) NULL,
32    [totime] [nvarchar](50)  NULL,
33    [day] [nvarchar](50) NULL,
34 CONSTRAINT [PK_dbo.InstructorCourses] PRIMARYKEY CLUSTERED
35(
36    [CourseID] ASC,
37    [InstructorID] ASC
38)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
39) ON [PRIMARY]
40CREATE TABLE [dbo].[Instructor_Class](
41    [ClassID] [int] NOT NULL,
42    [InstructorID] [int] NOT NULL,
43 CONSTRAINT [PK_dbo.Instructor_Class] PRIMARYKEY CLUSTERED
44(
45    [ClassID] ASC,
46    [InstructorID] ASC
47)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
48) ON [PRIMARY]

To make schedule for instructor i make relation between Instructor table and Courses table many to many and generate third table
InstructorCourses table have InstructorID and CourseID
But
How to add ClassID to table InstructorCourses although Class table have relation many to many with table Instructor