diff --git a/test/21_if_test2.sy b/test/21_if_test2.sy
new file mode 100644
index 0000000..bf7b8fa
--- /dev/null
+++ b/test/21_if_test2.sy
@@ -0,0 +1,25 @@
+// test if-else-if
+int ifElseIf() {
+  int a;
+  a = 5;
+  int b;
+  b = 10;
+  if(a == 6 || b == 0xb) {
+    return a;
+  }
+  else {
+    if (b == 10 && a == 1)
+      a = 25;
+    else if (b == 10 && a == -5)
+      a = a + 15;
+    else
+      a = -+a;
+  }
+
+  return a;
+}
+
+int main(){
+  putint(ifElseIf());
+  return 0;
+}
\ No newline at end of file
diff --git a/test/25_while_if.sy b/test/25_while_if.sy
new file mode 100644
index 0000000..47b8b79
--- /dev/null
+++ b/test/25_while_if.sy
@@ -0,0 +1,31 @@
+int get_one(int a) {
+  return 1;
+}
+
+int deepWhileBr(int a, int b) {
+  int c;
+  c = a + b;
+  while (c < 75) {
+    int d;
+    d = 42;
+    if (c < 100) {
+      c = c + d;
+      if (c > 99) {
+        int e;
+        e = d * 2;
+        if (get_one(0) == 1) {
+          c = e * 2;
+        }
+      }
+    }
+  }
+  return (c);
+}
+
+int main() {
+  int p;
+  p = 2;
+  p = deepWhileBr(p, p);
+  putint(p);
+  return 0;
+}
\ No newline at end of file
diff --git a/test/30_continue.sy b/test/30_continue.sy
new file mode 100644
index 0000000..b20cd55
--- /dev/null
+++ b/test/30_continue.sy
@@ -0,0 +1,16 @@
+//test continue
+int main(){
+    int i;
+    i = 0;
+    int sum;
+    sum = 0;
+    while(i < 100){
+        if(i == 50){
+            i = i + 1;
+            continue;
+        }
+        sum = sum + i;
+        i = i + 1;
+    }
+    return sum;
+}
\ No newline at end of file
diff --git a/test/33_while_if_test3.sy b/test/33_while_if_test3.sy
new file mode 100644
index 0000000..ef16dfa
--- /dev/null
+++ b/test/33_while_if_test3.sy
@@ -0,0 +1,25 @@
+int deepWhileBr(int a, int b) {
+  int c;
+  c = a + b;
+  while (c < 75) {
+    int d;
+    d = 42;
+    if (c < 100) {
+      c = c + d;
+      if (c > 99) {
+        int e;
+        e = d * 2;
+        if (1 == 1) {
+          c = e * 2;
+        }
+      }
+    }
+  }
+  return (c);
+}
+
+int main() {
+  int p;
+  p = 2;
+  return deepWhileBr(p, p);
+}
diff --git a/test/37_op_priority3.sy b/test/37_op_priority3.sy
new file mode 100644
index 0000000..e04c930
--- /dev/null
+++ b/test/37_op_priority3.sy
@@ -0,0 +1,7 @@
+//test the priority of  unary operator and binary operator
+int main(){
+    int a, b;
+    a = 10;
+    b = 30;
+    return a - -5 + b + -5;
+}
\ No newline at end of file
diff --git a/test/41_unary_op2.sy b/test/41_unary_op2.sy
new file mode 100644
index 0000000..a824266
--- /dev/null
+++ b/test/41_unary_op2.sy
@@ -0,0 +1,14 @@
+int main() {
+    int a, b;
+    a = 070;
+    b = 0x4;
+    a = a - - 4 + + b;
+    if (+-!!!a) {
+        a = - - -1;
+    }
+    else {
+        a = 0 + + b;
+    }
+    putint(a);
+    return 0;
+}
\ No newline at end of file
diff --git a/test/42_empty_stmt.sy b/test/42_empty_stmt.sy
new file mode 100644
index 0000000..a8c161f
--- /dev/null
+++ b/test/42_empty_stmt.sy
@@ -0,0 +1,5 @@
+int main() {
+  int a = 10;
+  ;
+  return a * 2 + 1;
+}
diff --git a/test/44_stmt_expr.sy b/test/44_stmt_expr.sy
new file mode 100644
index 0000000..a5f5bb5
--- /dev/null
+++ b/test/44_stmt_expr.sy
@@ -0,0 +1,13 @@
+int k;
+const int n = 10;
+int main () {
+	int i = 0;
+	k = 1;
+	while (i <= n - 1) {
+		i = i + 1;
+		k + 1;
+		k = k + k;
+	}
+	putint(k);
+	return k;
+}
diff --git a/test/50_short_circuit.sy b/test/50_short_circuit.sy
new file mode 100644
index 0000000..322855d
--- /dev/null
+++ b/test/50_short_circuit.sy
@@ -0,0 +1,21 @@
+int g = 0;
+
+int func(int n) {
+  g = g + n;
+  putint(g);
+  return g;
+}
+
+int main() {
+  int i;
+  i = getint();
+  if (i > 10 && func(i)) i = 1; else i = 0;
+  i = getint();
+  if (i > 11 && func(i)) i = 1; else i = 0;
+  i = getint();
+  if (i <= 99 || func(i)) i = 1; else i = 0;
+  i = getint();
+  if (i <= 100 || func(i)) i = 1; else i = 0;
+  if (!func(99) && func(100)) i = 1; else i = 0;
+  return 0;
+}