
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $f(x)=x-a\ln x- \frac {b}{x}-2$ $(a,b\in\mathbb{R})$.  
(I) When $a-b=1$, $a > 1$, discuss the monotonicity of the function $f(x)$.  
(II) When $b=-1$, $a\leqslant 4$, the inequality $f(x) < - \frac {3}{x}$ holds true in the interval $[2,4]$, find the range of the real number $a$.

Present the answer in LaTex format: \boxed{Your answer}
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