Answer:
50 Prepositions in alphabetical order:
1.aboard
2.About
3.Above
4.Across
5.After
6.Against
7.Along
8.Among
9.Around
10.At
11.Before
12.Behind
13.Below
14.Beneath
15.Beside
16.Between
17.Beyond
18.But
19.By
20.Concerning
21.Down
22.During
23.Except
24.For
25.From
26.In
27.Inside
28.Into
29.Like
30.Near
31.Of
32.Off
33.On
34.Out
35.Outside
36.Over
37.Past
38.Since
39.Through
40.Throughout
41.To
42.torward
43.Under
44.Underneath
45.until
46.up
47.upon
48.with
49.within
50.without