Draw a Bass staff and group notes equivalent to three crotchet beats using rhythmic patterns in 4-time?

Sure, here is a bass staff with three crotchet beats in 4-time:

```
G|----------------|
D|----------------|
A|---o---o---o---|
E|----------------|
```

In this example, each "o" represents a crotchet beat.

```
Bass Staff:

|---|---|---|---|---|---|---|
|---|---|---|---|---|---|---|
|---|---|---|---|---|---|---|
|---|---|---|---|---|---|---|

Rhythmic Patterns Equivalent to Three Crotchet Beats in 4-Time:

Pattern 1: ♩ | ♩ | ♩
Pattern 2: 𝅓 | ♩ | ♩
Pattern 3: ♩ | 𝅓 | ♩
Pattern 4: ♩ | ♩ | 𝅓
Pattern 5: 𝅓 | ♩ | 𝅓
```